There's a piece here on Digit magazine's blog about the 'under construction' symbols currently displayed on the hoarding on our building. (Above.)
They write that after spending a while trying to work out what it was advertising they realised, "It's not an ad as such. The building behind is actually the agency's London offices and the symbols are just there to cover up the chipboard, turning every studio's nightmare when trying to pitch to clients - the noise and ugliness of building work - into a showcase for the company... Ignoring the fact that it's commissioned by W+K as essentially an promo for itself, this is a piece of art not advertising -- though after years of guerrilla advertising and viral marketing, your first instinct is to wonder what it's selling. How long before we start regarding all street art from graffiti to pavement chalk paintings in this way?"
Brilliant - so we may have inadvertently created a whole new sub-genre of urban spam.