Roundels: THE logo of London. But you won't just find them in the city's tube stations and on its bus stops — once you start looking, roundels are EVERYWHERE...

Roundels that are visible from space Google Maps Image: Google MapsEver stopped dead in your tracks, as you realise you're walking over a giant roundel? That's what happened to us recently in South Croydon's Houlder Crescent (see above), which is not so much a crescent as a huge tarmac roundel. Yes, yes, there are infinite roundabouts in London, but the straight path through the centre of the grassy core here really lends it a definite roundel appearance. As chance would have it, to the immediate north is this even larger roundel:

Image: Google MapsThe 'bar' through the middle (in this case Denning Avenue) is sadly not as central as we'd like, but the concentric red roofed houses more than make up for it, bringing to life the red ring of the classic roundel. Or are we just spending too much time thinking about roundels?

A roundel on a statueDid Samuel Plimsoll actually invent the roundel? Image: duncan cumming via creative commonsEveryone knows the roundel was created in the early 1900s, then perfected by Frank Pick and Edward Johnston soon after. Or so they would have you believe. On Victoria Embankment, you'll find the lavish memorial to Samuel Plimsoll, the man behind the 'Plimsoll line' — not a long-lost tube line, but a measure by which ships can safely load up with cargo. On Plimsoll's bust is not one, but two of these Plimsoll lines, which you'll surely agree bear more than a passing resemblance to our friend, the roundel. Plimsoll came up with it in 1876 — two years before Frank Pick was born.

An ancient Egyptian roundelOK, now that's an old roundel. Image: Matt Brown/LondonistAnd roundels go back a way before that too. A trip to the British Museum reveals a hunk of ancient Egyptian stone (above) which is very clearly an early draft of the roundel. Could this have once been part of a Ptolemaic bus stop? Almost certainly. And sitting next to it: possibly the earliest moquette design known to man. Facts are facts, people.

A lunar roundelImage: Matt Brown/LondonistYou know we said that once you start looking, you can't stop seeing roundels... how about this snap we got of the moon with a contrail running right through the centre. Maybe it's a sign from Frank Pick in the Great Beyond. Maybe we need to have a lie down.

Various other roundelsSome other roundel-not-roundels that've caught our attention around London. Got a good one you'd like to add? Email your pic to will@londonist.com and we'll consider it.

The Southern Trains logo is... yup, a roundel. Image: John Ray via creative commonsThis one in Vauxhall isn't exactly subtle. Image: Matt Brown/LondonistA particularly ornate roundel in Hyde Park. Image: Matt Brown/LondonistThis might just be us having a roundel-induced breakdown. Image: Matt Brown/Londonist