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Go on a walk. There are four tags hidden around the block — look for these:

They sit at eye level, quiet and easy to miss if you're not looking. Here's where to find them:

Walk to each one in the right order. Hold your phone up to it for a moment, and tap the link that appears.

When you've found all four, you'll unlock a poem.

The poem arrives hidden — every letter covered. It fills in two letters at a time, each time someone walks the same path you just walked. The more people who come, the more of it you can read.

TAG 1

TAG 2

TAG 3

TAG 4