What are these mysterious pavement markings? Photo by Hannah Foulds.

What are these markings? Photo by Hannah Foulds.

Joolz Guides are bite size videos about uncharted spots in , presented by award-winning Julian McDonnell. Here he explains how pavements came to exist in London.

Julian has his own website http://joolzguides.com/ – full of bite sized guides to London. We have more videos from him in the coming weeks!

Original by the marvellous Terry St Clair.