This Colourful Image Will Disappear If You Stare At It Long Enough

If I look at another women for five seconds, it's pretty inevitable that my girlfriend will disappear.

Similarly, if you stare at this colourful image long enough, it will disappear completely.

Just by focusing on the center of the image, eventually all the colours seem to blend into one so the picture becomes blank.

Have a go...

Impressed? Or has it given you a headache? It's a bit of both for me.