When I did Art A level

...the teacher asked us to draw a wooden chair by drawing the spaces around the chair, not the chair itself.

Occasionally, I drive past the Churchill Insurance building in Bromley.

On the side of the building is an image of the familiar nodding dog made out of metal – not the whole dog, just its ears, eyes, nose, mouth and the markings on its face.

It looks like a random series of shapes.

Despite my chair experience, it took me ages to work out what it was supposed to be.

Der.