Do you know a way to confuse your brain? Play tricks on it? Ever see an optical illusion before? Well, here's a weird, but cool way to confuse your photoreception.
Stare at the picture faintly for 20 seconds. Then, blink a few times and who do you see? I know, this is freakishly cool, I will describe it to you if you want to know how it works.
HOW IT WORKS:
"When an image is looked at for a length of time (usually around 30 seconds) and then replaced with a white field, one type pf an effect called an afterimage can be seen. The common explanation given for an afterimage is that the photoreceptors (rods and cones) in the eye become “fatigued”, and do not work as well as the those photoreceptors that were not affected (the “fatigue” is actually caused by the temporary bleaching of the light sensitive pigments contained within the photoreceptors) This results in the information that is provided by the photoreceptors not being in balance, causing the afterimages to appear. As the photoreceptors become less “fatigued”, which takes between ten and thirty seconds, the balance is recovered, resulting in the afterimage disappearing"