we decided to create some kind of inverted overhead projector – we call it the under(xxxx)head projector.

A mirror on the rooftop reflects the light onto a second reflective surface that will create some kind of pattern by vibrating. There will also be another more controllable pattern inserted into the beam. A lens at the end will spread the light out onto a bigger surface. 4 sensors that border the area under the light will count how many people are in that area. This will make the controllable pattern react.