On this example you see a big rear projection wall. The entire picture is displayed by 4 projectors, so each one shows a quarter. Each segment fits perfectly to the next one. The entire picture looks great and brilliant..
The room behind this projection wall wasn't very deep. On top of that a tilted roof required to calculate the construction extremely precise. On the 3D simulation in the computer we saw, that there is only one way to build this difficult installation: the 2 upper projectors are mounted vertically, means the beam is going up - redirected by one mirror. The lower projectors are mounted horizontally and the beam is redirected by two mirrors