When you see an honest, no-funny-glasses 3D TV.
About a year ago I went to an open day at the
Diamond Light Source (Synchrotron). For a start it looks seriously sci-fi from the outside (less so inside - rather more concrete and rather less polished stainless steel than you usually see in the movies)
There were various scientists showing off what it would be able to do, such as find the structures of viruses - including 3D-printed (rapid prototyping) models. And there was a 3D TV just sitting there, showing a spinning CGI virus. And
no label. If that was me, there'd be sign there saying:
"
Come and look at this computer-model of a virus
on our
3D Television!"
I think it must have been one of
these.
Also, they had a robot-like arm with a little sphere at the end. You hold the arm and touch stuff with the sphere, and the computer (knowing what the angles of all the joints are) constructs a 3D model of the environment. They used it to check the precise positions of various important parts of the sychrotron.