"Overhead projector"

This is a Zeiss STARMASTER ZMP star projector - $3M of the most advanced star projector in the world. It reproduces the positions, colours and magnitudes of stars with stunning, unprecedented fidelity, and is so precise that it can project deep sky object images which are only visible with binoculars (yes, binoculars inside the planetarium).



This is an overhead projector.

It seems John McCain can't tell the difference.