Fun parlor tricks

[cetus]

Stare at this for 30 seconds or so then look at your hand.

 

[Pateedm]

no acid has ever given me that kinda visual effect 

[electroBeam]

My sister watched a trick similar to this and thought it was stupid/a waste of time.

I wonder how such people would ever realize the significance and implications of such alternative perception. I wonder what would make these people click, if they could.