harry wrote:

The nearest thing I saw to perpetual motion was a little turbine in a
glass bulb that just rotated. It was suspended on a diamond resting on a
needle, ie very low friction.

No, that's not perpetual motion, it a heat engine. It's no more
perpetual motion than the internal combustion engine. And somehow I
doubt that a diamond was involved, a glass bearing is good enough.

It was actuallypowered by light.

No, it was actually powered by heat.