How Many Matrices to Screw In a Light Bulb?
A light-bulb joke: one 90° rotation matrix does it, applied over and over.
Transcript
"How many matrices does it take to screw in a light bulb?" "Just [0 −1; 1 0], but you might have to apply it repeatedly." [A bulb shown rotating by quarter turns]
Use this cartoon
Free for classrooms, worksheets, slides and other non-commercial use under CC BY-NC 4.0, with credit to Ben Orlin.
Cartoon by Ben Orlin, Math with Bad Drawings. https://cartoons.mathwithbaddrawings.com/2018-03-07-how-many-matrices-to-screw-in-a-light-bulb/ (CC BY-NC 4.0)