optical illusion

[Witness]

Fix the central point, then move farther/nearer.

[Pyrrho]

That is a 2D Rick Roll

[Pyrrho]

Link: https://twitter.com/pickover/status/1111999781931499520

[shuize]

Best new one I've seen in a long time.

Can be spinning left or right.

Once your brain locks onto one direction, it's really hard to switch to the other. Try closing your left eye and right eye back and forth. You'll eventually see both.

The one turning counter clockwise has a better rack.

[xouper]

https://twitter.com/pickover/status/1111999781931499520

Here's another link to the same animation:
https://gfycat.com/likelyfaithfulabalon ... ppy-aww-ok

In addition to each ball moving in a straight line, there's another interesting mathematical relationship in there.

A pair of balls on opposite sides correlate to sin and cos, where the two balls travel orthogonally to each other (that's 90 degrees to normal folks). When one ball is at the center (0,0) the opposite ball is at the max, either (1,0) or (-1,0), and vice versa, thus if one ball represents the sine, then the other ball is the cosine, or vice versa, depending on which side of the railroad tracks you were born.

As demonstrated by this animation:



Of course all that is already obvious to anyone familiar with the theory behind the Fourier Transform. I am, of course, referring to Euler's Formula.

Fourier Transform:


And then substitute Euler's Formula:



Easy Peasy.

[Bruce]

Best new one I've seen in a long time.

Can be spinning left or right.

Once your brain locks onto one direction, it's really hard to switch to the other. Try closing your left eye and right eye back and forth. You'll eventually see both.

The one turning counter clockwise has a better rack.

That's part of the illusion. The one spinning right has more left boob exposed, and conversely, the one spinning left has more right boob exposed.

If you master your own perceptive capabilities, you can make both boobs fully exposed.

If you figure that out, teach me.