Kensington High Street, from 28 bus, 16th December 2005

This was the third day on which I'd seen two examples on the same day, which is quite remarkable given that this is only the seventh wild balloon sighting. There's some theory in psychology (the name of which escapes me at the moment) that says that if you see something once, your brain is primed to spot similar examples. So maybe that's what's happening. Thinking about that got me thinking: how many balloons had I missed because I'd not seen one earlier that day to prime my brain?