I found this little 1930s nightlight in a charity shop a few years ago. It has a small clear bulb, and the other is shaped like a parrot and is hand painted!
Inside the bottom was a very simple mechanism (nothing there!) I put in some batteries just to see, and after half an hour of fiddling, it just lit up! for a second.
But last night I think I managed to fix it, so you can change from clear to parrot depending on your mood!
I think it is amazing that such an old light bulb, still works after 80 or so years...even more so because it is a tiny wee parrot!