"The whole world is a very narrow bridge," said Rabbi Nachman of Breslov, the famed Chasidic mystic.

"Na Nach Nachma Nachman Meuman" is a mantra used by a sub-section of the rabbi's followers, and the words can be found scrawled on walls all over Israel.

A Breslov enthusiast in north London now appears to have brought the adage to new ground, tagging a viaduct in the Walthamstow marshes with a graffiti version of the phrase. An image of the daubing was posted on Twitter this week.

Little could we have imagined that the street artists of the capital were so familiar with late-18th-century spiritual Judaism.