You wrapped tin foil around a glass, set it next to a phone, and projected a rectangular display of the phone on the wall?
Please post a video. I'd be thrilled to be wrong about this.
Discussion
tin foil is for the stem. no foil needed with a tumbler. i'll send you a video when i get a chance
here is another one
Okay that's a very different setup. I can see how it works 🤙
sorry tin foil needed for the base if left open. we put ours against a wall.