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Description
[Left-click on animation for correct full size animation.]

This is how squeels get around, even though they appear to have no room to navigate.

Four frames, and two frames are the luminance inversions of the other two. On some browsers their are intermittent pauses and skipping of frames which extinguishes apparent motion. Best if loaded into an application that can run the animation smoothly.

I think this is directly related to the "Four stroke apparent motion " illusion.

In two of the frames there is a predominately black/white "edge" at texture boundaries, and this certainly has something to do with it. See the "Lucy in the Sky demonstration " for a simplified version of the effect where the motion rocks back and forth. This one continues the apparent motion in one direction using the inverse luminance for half of the full cycle.

Also see Edge contrast motion illusion , which depends on the same effect.

Here's a great video describing some of the biology and physics of how squid and cuttlefish accomplish dynamic coloration .

MATLAB

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There are no restrictions on use of this image. Claiming to be the originator or owner, explicitly or implicitly, is bad karma . A link (if appropriate), a note to markdow30@gmail.com, and credit are appreciated but not required.

Description
[Left-click on animation for correct full size animation.]

This is how squeels get around, even though they appear to have no room to navigate.

Four frames, and two frames are the luminance inversions of the other two. On some browsers their are intermittent pauses and skipping of frames which extinguishes apparent motion. Best if loaded into an application that can run the animation smoothly.

I think this is directly related to the "Four stroke apparent motion " illusion.

In two of the frames there is a predominately black/white "edge" at texture boundaries, and this certainly has something to do with it. See the "Lucy in the Sky demonstration " for a simplified version of the effect where the motion rocks back and forth. This one continues the apparent motion in one direction using the inverse luminance for half of the full cycle.

Also see Edge contrast motion illusion , which depends on the same effect.

Here's a great video describing some of the biology and physics of how squid and cuttlefish accomplish dynamic coloration .

MATLAB

----------------------
There are no restrictions on use of this image. Claiming to be the originator or owner, explicitly or implicitly, is bad karma . A link (if appropriate), a note to markdow30@gmail.com, and credit are appreciated but not required.