Entertaining video from YouTuber David Alvarez. I have a hard time imagining that he’s not working from a plan of some kind, but just from watching the video, it rather looks like he’s “free-handing” his Heath-Ledger-Joker mosaic. He just stands there, solves each cube to present the right pattern, and sets it in place, apparently without any kind of reference.

Rubik’s Cube mosaic puzzle