Science Quiz

Q: Are these lines straight?

A: Yes, they are. The lines appear to be curved because of the placement of the smaller black and white squares within the larger ones.

Created by Japanese visual-illusion expert Akiyoshi Kitaoka, the smaller black and white squares create perceived tilts that make our brain see the lines as wavy.


•Credit: Science Centre Singapore

A version of this article appeared in the print edition of The Straits Times on July 17, 2015, with the headline 'ScienceQuiz'. Print Edition | Subscribe