Visual Illusion: Sloping Lines Small 320×105 Medium 640×211 Large 1024×337 Download Tiff Original 2400×791 | (1.8 MB) Description If you fix your eyes on the two white spaces between the lines it will appear as if the top space becomes wider at the ends, and as if the bottom space becomes wider in the middle. But both lines are perfectly straight. Keywords Visual illusion Galleries Visual Illusions Source: Arthur Mee and Holland Thompson, eds. The Book of Knowledge (New York, NY: The Grolier Society, 1912)
