Brett Hurley. Elite Member. I'm working on a project and I'm intending to utilize a 'Spreadwave' type display. I don't know the gimmick of Mathieu Bich's 'Spreadwave' nor am I attempting to try and probe for what it is--my question is about the reveal cards themselves: For those who have the effect. Since each card has a small fraction of the large writing that reveals the chosen card; what is the width of one of the writing fractions?
If this is somehow on grounds of revealing, I apologize and will not go into it any further. If it isn't, any help is greatly appreciated! RealityOne Elite Member. Nov 1, 3, 3, New Jersey. Well, it's complicated. Really, it is. The only way to know what you bought has those restrictions is to open up the card box, which doesn't make them legally binding see a similar losing Microsoft lawsuit.
The trick is not bad, but buying this is pointless if I can't perform it. Beautiful, elegant, artistic I cannot recommend this trick more. It is my favourite trick I own. This takes about a days worth of experimentation with the deck and practice and you can get this down almost flawlessly.
It is such fun to perform as well. I think the best way to perform this effect is just like Mathieu Bich did on Fool Us- using the advanced handling and Massive Attack soundtrack. During my first performance of this effect, i had my iPhone just lying on the table to play the music.
The response was some of the best i have had. This effect has such a clever method and is something different and truly amazing. Your audience will not expect it and the final revelation often takes the breath away or even as was the case for me makes them chuckle in awe. I highly recommend this trick to anyone who does anything where this can be used- shows, weddings etc. Although it is not ideal for close-up situations if you think you will have any use for it, just purchase it!
Truly awesome!!! I agree with other reviewers that this is a truly genius card magic effect. I love Mathieu's approach to magic. This effect gets quick applause. I do not agree that the reset takes a minute. It takes around 20 seconds, tops!!! And I don't think it takes months to prefect. This is an effect that one can train for in a weekend and then go out and perform!
The lack of patter is perfect as well! It needs none! Purchase and enjoy the wows! I got this yesterday and I will say that this trick is so much fun--it only took me 2 hours to learn I was expecting it to by way harder and the method is simple enough that it will be easy to remember longer term if you need to understand the genius system, not memorize sequence of moves, then it is easy.
The cards are designed with hidden keys to make reset easy about a minute. For those that argue that the cards stick together, you could then make your own deck from a bicycle black card stock.
If this type of effect appeals to you as something super different, direct, and memorable, I'd say go for it! I was amazed at how simple it was to learn and perform the trick after watching the video and learning the secret. Be carefull with a the cards as mine would slide around a bit when stacked and might reveal a bit of the gimmick. Overall this is fabulous trick. Five different audio samples were used. The fifth audio sample was a 40 Hz sine oscillation produced by an online tone generator audioMTG40Hz used to get further information concerning the amplitude and frequency reproducibility of the MTG-system.
To examine trial-to-trial reliability, five repetitions of each audio sample were played and recorded at the same day. To evaluate the objectivity and validity, the audio of 40 Hz sine oscillations was used. The measured parameter was the amplified voltage of the piezoelectric sensor gathered from the mechanical oscillations of the subwoofer during audio replay ex vivo. The raw data of each curve were used for data evaluation.
Each recorded MTG-signal was cut into a short interval of 0. The 0. For further statistical comparisons the arithmetic means M and standard deviations SD were calculated.
To compare the trials to randomized matched curves, MTG-signals of the three different audioMTGAchilles were used to form five random groups.
The above listed parameters 1 to 4 for estimating the reliability were also calculated for the randomized groups. To statistically compare the identical repetition trials to the randomized matched curves, the t-test for dependent samples was used in case of normal distribution MCC, ICC and the Wilcoxon-test for the not normally distributed parameters MD, CA. The curve shapes of the recorded repetition trials ex vivo are shown in Figure 2. In each diagram, five or ten repetitions are displayed illustrating good reproducibility.
To illustrate the reproducibility of the oscillation characteristics of the original MTG-signals in vivo and the corresponding recorded audio sample from this investigation ex vivo , Figure 3 shows examples of both signals and indicates that the frequency is reproduced precisely, but the amplitudes differ.
The 10 signals lie highly reproducible one above the other. To quantify this, parameters 1 to 4 are regarded. Displayed are the recorded MTG-signals, which were played by the subwoofer and picked up by the piezo-based measurement system. Each five trials of the same MTG audio sample and, respectively, 10 repetition trials of the 40 Hz sine audio sample are displayed in one diagram. This is further supported by the group comparisons between identical and randomized matched groups.
These results indicate a significantly higher correlation for the identical repetition groups compared to the randomized matched ones. The MD are significantly lower in the identical repetition group with averagely 0.
The results of the present investigation examining the reliability of a piezo-based measurement system ex vivo show the significantly higher correlation values and significantly lower mean distances for the trials of the identical repetition group compared to the randomized matched ones. All parameter 1 to 4 display the similar curve behaviour during repetition trials of the same audio sample. This indicates a high reliability of the piezo-based measurement system ex vivo.
The randomized matched signals behave inverse: The correlation parameters show, if at all, low correlation values and the MD are more than six times higher compared to the repetition curves of identical audio samples. This indicates a good distinction between different signals. The comparison of the original audio signals in vivo and the recorded signals ex vivo Figure 3 demonstrates a good agreement of wavelength indicating the high reproducibility of the frequency.
The amplitude is lower in the recorded audio signal and partly shows signs of distortion. Reasons for this lie probably in the replay of the subwoofer.
Because the undistorted original signals were detected in vivo by the same sensor type, the sensor can be excluded as origin for this phenomenon. Furthermore, especially in low frequency areas below 30 Hz, the subwoofer might not be able to reproduce the sounds adequately.
That was one reason to choose the in vivo MTG-signals of the Achilles tendon after impact as base for the audio samples, which show higher frequencies. This limited frequency response is especially visible by comparing the original MTG-signal of the triceps brachii tendon and the re-recorded audio MTGtri-signal using the subwoofer Figure 6.
It is clearly visible that the signals do not match. This is led back to the low frequencies around 15 Hz of the MTGtri-signal. It is concluded that the reproducibility of five repetition trials is very good, although the subwoofer shows a limited frequency response.
It is assumed that with another subwoofer reproducing the low frequency ranges properly, the original and the recorded signals would be as similar as it was found for the MTG-signals of the Achilles tendon after impact.
However, usually subwoofers are not required to play frequencies below 20 Hz, since they are not hearable for humans. Infrabass subwoofers would be able to reproduce such frequencies but are only used in the professional event areas and are very expensive. Therefore, an infrabass subwoofer was not applicable here. However, the aim of showing the reproducibility of repetition trials still is reached in the presented setting. The oscillations produced by a muscle or tendon is rather comparable to inharmonious structure-borne sound.
As was shown in the results, the reproducibility of a former biological inharmonious signal is also captured in a reliable way using the subwoofer. Therefore, it can be concluded that the piezo-based measurement system is a valuable tool to record mechanical pressure waves.
This is not surprising regarding the common application of those sensors in music. If the piezoelectric sensor would not reproduce the mechanical pressure waves in frequency and amplitude appropriately, the sound would be distorted.
From experiences in the Neuromechanics Lab, piezoelectric sensors pickups reflect the mechanical oscillations very precisely with an exceptional good signal to noise ratio SNR. The raw data of the in vivo measurements are displayed in Figure 6 , where no filtering or smoothing were performed. None of the acceleration sensors we tested could reproduce such clear signals directly from the muscle belly or the tendon.
Comparison of the original in vivo MTG-signal of the triceps brachii tendon black to the corresponding recorded audio signal using the technical setting ex vivo red.
We presented here the most appropriate ones from our experience. However, we already had a new batch of the Shadow SH sensor, which have changed in quality. There are other pickups, which turned out to be suitable regarding the SNR. However, they had a larger diameter and turned out to be not as practicable for fixing onto the skin above the muscle belly or tendon. Beside the choice of a suitable piezoelectric sensor, an essential factor is the used amplifier.
Since the Nobels preamp booster pre-1 turned out to be suitable and reveals extremely clear signals, they are used in our investigations. The piezo-based measurement system was already used in several MTG studies in vivo. This also indicates that the used piezo-based measurement system is a valuable and valid tool to measure tendinous and muscular oscillations in vivo. The comparison of the here presented reliability results in the technical setting to measures of a recently conducted study in patients with Achillodynia lead to further assumptions.
This behavior is rather comparable to the here presented randomized matched group MCC: Achilles tendon in vivo : 0. This comparison indicates that immediately after an impact a healthy preloaded Achilles tendon oscillates in a more variable way, which tends to behave like randomized matched trials.
Affected Achilles tendons achillodynia oscillate in a way, which rather matches the repeatedly recorded similar audio-signals of MTGAchilles ex vivo , which show excellent reliability.
It is assumed, therefore, that the higher variation in healthy controls is due to a necessary biological variability, which obviously plays an important role in healthy neuromuscular systems. Because of their natural variability, biological systems will never produce identical wave patterns. Therefore, the validation of the reliability of such systems in vivo is limited. Photos could be larger and brighter, but, fully explain all required moves. Re-setting requires some "private-time". It constantly reminds left-handed viewers of the required adjustments.
Moves are not difficult, but, are complex and precise. Spreadwave is very do-able by any proficient, performing-magician. The quality of the cards suggest that - with care - they will be useful for a reasonable number of performances.
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