I created a custom frame because I wanted the canvas board to float in front of a white board (so that the black edges of the canvas board are visible), and I wanted the outer black frame to be rather thin.
I like to think about math and science at two levels when I create these drawings: 1) About the math underlying the physics of the gyroscope and 2) about the construction and descriptive geometry.
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The red / violet cone is moving, rolling along the surface of the blue one while its axis traces our the yellow one.