Why a window
The glass is what makes it work
A projector aimed at a wall is a movie. Aimed at a window from the inside, it becomes a figure standing in your house, seen from the pavement. That is the whole trick — and it is why the picture has to be bright enough to survive the glass.
- Bright enough to read from the street
- Looks solid, not washed out
- Best on a blind, curtain or projection sheet