annotations asked: I was thinking of that poem! Sort of. Only in the sense that it describes--in part--the interest of convex mirrors. Curves!

... Vasari says, "Francesco one day set himself 
To take his own portrait, looking at himself from that purpose 
In a convex mirror, such as is used by barbers . . . 
He accordingly caused a ball of wood to be made 
By a turner, and having divided it in half and 
Brought it to the size of the mirror, he set himself 
With great art to copy all that he saw in the glass

Curves. (re: this)