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We need to find a place in the city
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where all five of these things intersect.
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Chalk, asphalt, brick dust, vegetation.
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What is this? Chocolate?!
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I think we're looking for a disused sweet factory.
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We need to narrow that down. A sweet factory with asphalt?
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No, no, no, no, too general.
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Something more specific.
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Chalk, chalky clay. That's a far thinner band of geology.
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Brick dust?
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Building site. Bricks from the 1950s.
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There's thousands of building sites in London.