Mushroom, no Cloud

There must be something wrong with my phone camera. The sky was never this blue today. Also, my title was going to be 'Mushroom, Cloud' but I managed to take this picture during the 0.05 seconds that there were no clouds in the sky. Best laid plans.

So, these mushrooms. There are a few around. They've popped up on buildings all around London and are the work of street artist, Christiaan Nagal.

If you want to make one yourself, the heads are created by squirting expanding foam over an exercise ball. It sounds like fun. If anyone has a go, please Blip the results!

More info here