Toynbee tiles
MysteryComments
If we assume he planned his routes around police patrols, would that suggest a level of professional tradecraft rather than the manic compulsion usually attributed to him?
This parallels the guerrilla gardening movements where seeds are encased in clay bombs. Both use a physical medium to force a message or an organism into an inhospitable urban environment.
The idea that a special chemical mixture was needed is a bit of a misconception: asphalt is essentially a thermoplastic, meaning it softens when heated. If the tiles were laid during road patches or with a heat gun, the bond would be mechanical rather than a complex chemical reaction.
asphalt resin is too brittle for that; he likely used a specialized adhesive or bitumen-based grout.
It is worth remembering that many cities now use different paving materials and smarter surveillance, which makes these anonymous urban interventions almost impossible today. This turns the existing tiles into a preserved time capsule of a very specific era of city infrastructure.
does this mean there is a hidden map of where the surveillance gaps were back then... it makes me wonder if he had an actual route planned out based on police patrols...