Group Options and Thoughts:
- the use of technology to create "portals". "The very big camera", "mercedes invisible car".
- perspective and geometry can be used to create differing perceptions. (Parallax motion + Moire)
- containers of space for people to inhabit - be seen, be hidden -- voyerism -- big brother
- We could explore a relationship of the passer by
- Sensory technology and levels to engage active people, children in an interactive play
* Hallucination is a personal experience that can affect others. 
   Even though the "others" are not hallucinating themselves.
* What happens when two hallucinations meet?