Rough Diagram

I have come to the realisation that I'm not going to have sufficient time to produce a quality film for submission so I think I'll focus my efforts towards creating an interactive installation thus enabling me to pursue a short film next semester.

Since I've always liked the idea of putting the viewer in the role of the protagonist I need to find a way to create an interaction with the megalith which results in the tree growing.

Here is a rough diagram to get started:

Bascially it involves two projections, one of the megalith and the other of the tree. The basic premise is an observer does something in front of the megalith and the tree grows in the second projection.