The yellow round thing is a glass of champagne (honest!). The yellow bell-shaped
thing is a yellow bell. Each is illustrated in one of the videos.

The animated bell is a present from Helen. It came as a kit and I had to solder
it myself. There are more than 200 joints. I made a few mistakes (mostly lifting
the tracks off the board while chopping off the legs of the components) and had
to make some dubious repairs, as you see. These photos and the video prove that
it did work at least once.