I gathered that the moving images are not real, but are like painted pictures brought to life; and that the machine allows one to control one of these images according to an arbitrary set of rules that replaces the ordinary laws of nature. But I have not found one who could explain how those images can move. The best theory I thought of is that some mechanical artist is erasing then re-drawing them with inhuman speed, but I admit, that sounds faintly ridiculous.

Your presence is always welcome, and your wisdom equally so.