Make an animation starting with a chess board and finishing with a chess board in a maximum of 180 frames. That was the brief on a twitter thread recently. There were some very clever entries.
Craig S. Kaplan collected and assembled all the submissions into the video shown here (a huge amount of work, read his article if you're interested). His website is a good place to view - you can change the speed of the animations and the quality of the display is better.