Anti-perch spikes / by Dan Lockton

Spikes near Edinburgh CastleSpikes near Edinburgh Castle

These spikes on a window ledge in Lawnmarket, Edinburgh, look quite old. The ledge is steeply angled, so would be difficult to sit on anyway; if anything they'd make it easier actually to climb up to the window if breaking in were a concern. All I can think is that they attempt to stop people 'perching' on the ledge to rest for a few minutes - presumably this must have been a problem? Any other suggestions welcome!

More anti-sit devices and anti-homeless benches.