Bollardology: Observing the City of LondonBollardology: Observing the City of London is the world's first history of the City of London's bollards. The distinctive black bollards with their red stars and lemon squeezer tops brand the City's streets. What do they mean? How old are they? What do they say about the Square Mile today? All Square Mile observers will find intriguing content here: strange tales from the past, tips on bollard spotting, insights into the ever changing City streets.