## optical illusion

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Witness
Posts: 33018
Joined: Thu Sep 19, 2013 5:50 pm

### Re: optical illusion

Fix the central point, then move farther/nearer.
Pyrrho
Posts: 30912
Joined: Sat Jun 05, 2004 2:17 am
Title: Man in Black
Location: Division 6

### Re: optical illusion

That is a 2D Rick Roll
The flash of light you saw in the sky was not a UFO. Swamp gas from a weather balloon was trapped in a thermal pocket and reflected the light from Venus.
Pyrrho
Posts: 30912
Joined: Sat Jun 05, 2004 2:17 am
Title: Man in Black
Location: Division 6

### Re: optical illusion

The flash of light you saw in the sky was not a UFO. Swamp gas from a weather balloon was trapped in a thermal pocket and reflected the light from Venus.
shuize
Posts: 3840
Joined: Tue Nov 14, 2017 4:32 am

### Re: optical illusion

Bruce wrote: Fri Feb 09, 2018 4:34 am 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
Posts: 9737
Joined: Fri Jun 11, 2004 4:52 am
Title: mere ghost of his former self

### Re: optical illusion

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
Posts: 20586
Joined: Wed Jun 09, 2004 11:46 pm
Title: Bruce of all Bruces
Location: Massachusetts

### Re: optical illusion

shuize wrote: Sat Apr 06, 2019 10:50 pm
Bruce wrote: Fri Feb 09, 2018 4:34 am 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.
Such potential!
Witness
Posts: 33018
Joined: Thu Sep 19, 2013 5:50 pm

### Re: optical illusion

Witness
Posts: 33018
Joined: Thu Sep 19, 2013 5:50 pm

### Re: optical illusion

Witness
Posts: 33018
Joined: Thu Sep 19, 2013 5:50 pm