So how your eyes do after viewing these optical illusions. (above image: are the lines straight or angled?)
Which way is the train going?
What color is the background?
Find the way out of the maze
Scroll the picture up and down to escalate the effect
Count the black dots
2 prongs at one end that morph into three cylindrical prongs at the other
Charlie Chaplin mask turns inside out
Is the bottom image larger? Nope.
Parallel lines that appear to be diagonal
Red lines straight or bent?
Cup of Tea
Even squares are not what they seem
Clockwise or counter clockwise?