Besides his work on the fortifications of cities (notably Basel and Frankfurt), Faulhaber built water wheels in his home town and geometrical instruments for the military.

I believe this to be true, and I've tried to follow Galileo's guidance in describing the mathematics of particle physics using only triangles, circles and other geometrical figures.

I will do so with the help of words, of course, but also a geometrical shape, the circle, so throughout my talk, you will come across several circles.

Its characters are triangles, circles and other geometrical figures, without which it is humanly impossible to understand a single word of it without these, one is wandering around in a dark labyrinth.

So in the Charles Bonnet hallucinations, you have all sorts of levels, from the geometrical hallucinations the pink and blue squares the woman had up to quite elaborate hallucinations with figures and especially faces.

He was a prodigy at the age of twelve he wrote a memoir on four geometrical curves and under his father's tutelage he made such rapid progress in the subject that in his thirteenth year he read before the Académie française an account of the properties of four curves which he had discovered.