Professional lighting designers know about throwing a pattern of light on a wall, using what they call a cookie (cucalorus), a metal pattern slipped into a holder just next to the projected light. Now, Reveal projects a stationary pattern of a window onto the wall, and it also makes a shadow of trees move as if they're being cast about by a gentle breeze.
In most circumstances, there's no such thing as too many windows, and with this device, you can add another one without punching any holes in the walls. This would be a great-looking decor item, or could even be used as lighting for shooting videos. Neat. No pricing was announced, but it's set to ship in April of this year.