I redesigned a mechanism for an automata I've been working on for over a year for the fourth time, and now it's like half the size and way more reliable then the previous prototype.
I think Kolanaki, Zacharia, Margot Robbie (since she's famous already), are the ones I can remember. Maybe making a journal page for keeping track would help.
Playing guitar, or doing something else where I can't be thinking about it in the background such as Tetris as the other person mentioned, or reading a book