I don’t think that sticking them to the ceiling with museum putty is actually the way to do it. But, I didn’t know that until I tried it. I think I have to attach the birds to something sky/cloud-like and attach that to the ceiling.
When I was prowling around the art center looking for another way to fly the birds, I found people crocheting sleeping mats for the homeless out of plastic shopping bags.
See what you have to look forward to if you are lucky enough to get old? Kinda scary, isn’t it?