Yesterday it was the other way round, with cycle parking apparently a nesting-ground for frameless wheels (top, Barbican; middle, Southwark Bridge Road), the remainder of the bike having easily been liberated without the need for bolt-cutters.
Are the two types connected? Are theft patterns changing to reflect different types of carelessness among those locking up their machines?
Is this juggler anything to do with it, perhaps using the bike racks to store his equipment between street-entertainment gigs?
Biking round London is full of such mysteries. None as mysterious as the Horseferry Road contraflow, though, about which more tomorrow...