This Gfycat GIF video titled 'Benham's disk', sourced from http://d24w6bsrhbeh9d.cloudfront.net/photo/a1AopYY_460sa.gif, shared on Reddit.com/r/woahdude/27vir3/benhams_disk_not_everyone_sees_the_same_colours contains: interestingasfuck, woahdude