Now, this doesn’t quite have the impact unless it’s moving. But it’s still quite spooky.

Gareth has a recording of his face, that’s being projected with a video projector.

If it was being projected onto a flat screen, it would look like this.

But it’s not. It’s being projected onto a mannequin, like this.

It’s actually a very accurate plaster cast of Gareth’s face – so the projected Gareth looks spookily like… well, Gareth. The head is mounted on a tailor’s dummy to give the false Gareth a body.

As the recorded video of Gareth looks around and talks, the mannequin looks amazingly lifelike. This technique is used at exhibitions and theme parks. When it’s combined with animatronics to make the dummy’s arms move, the effect is even more realistic.

But you can also experiment a little. Here’s a recording of Fred’s face, projected onto Gareth’s head. Weird.

Stranger still: here’s Gail’s face, projected onto Gareth’s head. Click the picture to see it larger (that goes for all these pictures, by the way).

Eu eu eu! That’s just too weird.