altering the angle of each line very slightly

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elinor

Senior Member
Mandarin
"A simple way to demonstrate the illusion of motion is to draw a line in the lower right-hand corner of each page of a pad of paper, altering the angle of each line very slightly in a single direction. If the pages are then riffled at a rather fast pace, the eye will perceive the illusion of a moving line."



What does it mean? Is it a curvy line or a straight line?




Thanks a lot.
 
  • Egmont

    Senior Member
    English - U.S.
    What's important here is that all the lines are of the same shape. That's easiest if they're all straight, so that's probably how I'd interpret the instruction, but they don't have to be.
     
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