Sender: dntx Winter Bird Listens to the Snow, message area: ASCIIArt Title: Breathing Square Comparative Version Sending station: BBS Westward Journey Station Wed May 1 01:17:39 2002 Two green squares of the same size are rotated due to their different stacking relationships with the small red squares. The square on the left feels like it's changing in size, as if it's breathing. For comparison, the square on the right has no change in size. Please refer to http: www.xinli.net qq illusion hall class breathing square.html