Science Quiz


Q Are the diagonal lines parallel?

A Yes. The angle of the short lines helps to create the impression that one end of the longer lines is nearer to us than the other end.

• Credit: Zollner Illusion by Johann Karl Friedrich Zollner

A version of this article appeared in the print edition of The Straits Times on September 18, 2015, with the headline 'ScienceQuiz'. Print Edition | Subscribe