Brooklyn lighting designer/artist Adam Frank's Reveal product is a projector system to create a gauzy, ethereal effect of sunlight streaming through shadowy trees. This will be ideal for my underground lair and loaning out to the neighborhood haunted house on Halloween. The Reveal is $280 for halogen $320 for the LED model. It includes five different window slides and five different tree slides. From the product description:
A light breeze appears to move through trees in the cast image. REVEAL implies the presence of a real window by simulating sunlight entering through an imaginary window.
The image projected by REVEAL is unique and cannot be recreated by any other device. Multi-plane analog images create real depth of focus. Air currents through the projector create organic, non-repeating movement in the background.