There is a wonderful Leonardo da Vinci exhibit in the Church of San Cristoforo on Via Fillungo near the intersection with San Croce.
A fascinating array of his creations are on display and many are working models.
They fill the cavernous space with his genius. Leonardo was born in the 1450's and his concepts were in many cases, generations ahead of their time. He was, of course, also a painter of exceptional talent and world renown.
The father of modern aviation?
There is also an octagonal mirror room he created which I entered and took a unique selfie of sorts. Does that mean that Leonardo conceived the idea of the "selfie?" Perhaps.