These lines are actually parallel even though they appear to curve.
The square in the middle appears to be curved but its perfectly straight.
Here's an entertaining show put on by 2 guys and a pommel horse.
Slowly move away from the screen. Does anything happen?
What starts out kind of slow and stupid ends in epic fashion.
The table tops are actually the same exact size! Cool illusion that you can try yourself.
Stare at the screen for 60 seconds and then look at you hand. Holy Sh*t!!!
This will bug out your eyes.
Just try to focus the best you can on this animation.