I decided to start this discussion a bit before I had planned. Yes, I’ll be going back to Partridge’s book and the problems with Balducci’s oddly uninformed position (this week, too). I keep getting links and emails related to the “compelling” evidence for UFOs in Renaissance art, so my annoyance meter has passed the tolerable level.
The UFOs in Renaissance art nonsense primarily extends from Matthew Hurley’s website. An informed rebuttal to this has been out on the web for some time, but it apparently hasn’t been widely discussed or circulated — likely due to the fact that most of it isn’t in English.
Art historian Diego Cuoghi (yes, a real art historian) has a website devoted to analyzing the paintings on Hurley’s website. Sorry, they aren’t extraterrestrials and space ships. The main site is here, but it’s in Italian. But Parts 1 and 5 have been translated into English. I highly recommend them – very interesting and informative, but not for those who are fundamentalist ETH’ers.
You definitely need high speed for all these images, too.