It's all in the shadow's!
A 'Brain Sync Disc' ~ really impressive. I think it's got to do with our brains clock-time (mind registering time), so that each time one of those patterns happen to fall into our timing zone, it suddenly becomes synced.
Mythopoeika
I am a meat popsicle
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brownmane
off kilter
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I didn't notice the frame rate. I could willingly see the spin direction change when I decided to change my perception. And could change my perception back immediately, or several seconds later. Of course the only time I could do this was once the lines for each row became apparent to me ie the spin rate slowed.
Probably in this video, it has more to do with 'the wagon wheel effect' than brain! However, recall what happens when you watch a cars wheel turning in motion - at certain speeds, it will appear to go backwards; forwards (normal), or appear to stop turning altogether. I believe the principle is just the same ~ both with eye (message to brain
), or with camera 
frame rates.Actually ~ loosely connected to this thread (this might have to be placed under different heading ref?), I discovered something along the same lines, but with sound!
I was passing by my switched on upright fan on a stand after taking a shower, and I happened to notice ~ as I was whistling at the time, that the sound seemed to take a sudden 'wagon-wheel-effect,' but in the sound deflection!
As the blades of the fan are twisted (normal), I wondered if it was the twist of the blade that was distorting and returning the sound in a different form, or/and, as well as how fast the blades were turning, as the returning sound (towards the centre of the fan) itself sounded sort of 'chopped-up,' or 'twisted,' or at least in a different (distorted) form from my original whistled pitch! It was quite a pleasant - different amplification from the sound that I had whistled.
I was passing by my switched on upright fan on a stand after taking a shower, and I happened to notice ~ as I was whistling at the time, that the sound seemed to take a sudden 'wagon-wheel-effect,' but in the sound deflection!
As the blades of the fan are twisted (normal), I wondered if it was the twist of the blade that was distorting and returning the sound in a different form, or/and, as well as how fast the blades were turning, as the returning sound (towards the centre of the fan) itself sounded sort of 'chopped-up,' or 'twisted,' or at least in a different (distorted) form from my original whistled pitch! It was quite a pleasant - different amplification from the sound that I had whistled.
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Regarding the expanding black hole illusion (post #642), here's the corresponding paper showing that it also expands the pupil whereas coloured ones constrict the pupil:
https://www.frontiersin.org/article...hole-illusion-tricks-eye-pupils-into-dilating
https://www.frontiersin.org/article...hole-illusion-tricks-eye-pupils-into-dilating
Good job they decided to show the explanatory view, or that would be a 'head-bender!'
PeteByrdie
Privateer in the service of Princess Frideswide
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I had a couple of these; the t-rex shown here and a dragon. It's basically a hollow face illusion. I found the patterns online somewhere and printed them out. My ex may still have one, I gave my brother the other one. Close up, they work best with one eye closed. They certainly amused everyone at the time. This video may be the first time I saw them.
Tunn11
Justified & Ancient
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PeteByrdie
Privateer in the service of Princess Frideswide
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For anyone printing and assembling one of these, I found the 'head' portion sagged over time. I know it's just a novelty but ours hung around for quite a while. A little slither of wood or something similar glued to the back of the neck should help him keep his chin up.
brownmane
off kilter
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What about printing out the template and then gluing it to bristol board to give it better support?
PeteByrdie
Privateer in the service of Princess Frideswide
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Sure. I'd be interested in the results.
brownmane
off kilter
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Unfortunately it won't be me. I don't have a printer. Anyone else up for a go?
SimonBurchell
Justified & Ancient
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I'm very tempted...
PeteByrdie
Privateer in the service of Princess Frideswide
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I can tell you my ex's kids thought it was great. So if you have kids or grandkids they'll probably get a buzz out of it.
Coal
The Ultimate Skepticus
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Blocked due to trojan...
Tunn11
Justified & Ancient
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Odd, I've got Norton and it blocked a tracker but let me download it.
PeteByrdie
Privateer in the service of Princess Frideswide
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These metallic orb's seem to be landing everywhere!
brownmane
off kilter
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I was noticing that his hand changed and looked further away from when he placed the ball down and then when he picked it up. Then he showed how it was set up. I was at least on the right track.
This one is very effective as it tends to show perspective - unlike 'the floating cube' (above) which does not.
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Floyd1
Antediluvian
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Don't forget your 'tuth-pick'.
TangletwigsDeux
Abominable Snowman
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Good moving album cover ( Fuxa - Dirty D). Makes your eyes wibbly.
