Keywords: Mach band90.svg A 90 degree rotated version of Multiple areas perceived by human eye as containing Mach bands Mach_band svg 2009-04-11 06 14 UTC Mach_band svg DancingPhilosopher derivative work DancingPhilosopher <span class signature-talk >talk</span> Own work ~~~~~ ~~~ Public domain Optical illusions</nowiki> Uploaded with derivativeFX Mach bands |