For those of you interested in drawing (and computing), here is a wireframe study of a chalice attributed to Paolo di Dono (aka Paolo Uccello), dating to c.1450-70. (Note that there are competing theories about its creator; some think it may have been Piero della Francesca.)
And a study of a mazzocchio:
with a ‘rendered’ version:
(project idea: geometric head gear?)
