[quote=Magic Magnum]
You added a colour shader.The dot could easily be photoshopped on top of both afterwards.I don't see the sorcery, unless if lazy photoshopping is now worthy of being called magic. :/
[/quote]

Let me explain...no, there is too much. Let me sum up.

The dot is just a focus for your eyes, gazing at the focus during the inverted color time locks those colors in your eyes. When the colors are then muted, the brain has to take a moment to realize this, and instead places the correct colors over the black and white second image. The inverted color's natural shades.

Visual trick.