[guenthert]

I think this is much more than an optical breadboard. The trick with the periscope is IMHO neat and allows for clean separation of the user's experiment from the invariant photon generator/detector part. Turning on the guide beam with a touch of a button is magic to anyone who had to labor on an optical table.

This might allow for set-up, alignment and conduction of an experiment within the short time allotted in educational settings, which would be quite a challenge using less smart constituents.