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The study of polyomino tilings largely concerns two classes of problems: to tile a rectangle with congruent tiles, and to pack one of each n-omino into a rectangle. A classic puzzle of the second kind is to arrange all twelve pentominoes into rectangles sized 3×20, 4×15, 5×12 or 6×10.
"Nothing written", self-referential visual wordplay, vertical axis reflection. Historical Maoam logo (candy), vertical axis mirror ambigram, between 1900 and 1931. When the reflecting surface is vertical (like a mirror for example), the calligraphic design is a vertical axis mirror ambigram .
A practically important case is the self-oscillation of the strings of bowed instruments such as the violin, cello, hurdy-gurdy, erhu, etc. A connection between dry friction and flutter instability in a simple mechanical system has been discovered, [ 71 ] watch the movie Archived 2015-01-10 at the Wayback Machine for more details.