the sand garden
Drag across the sand and it keeps the line. This is the only place here that remembers what visitors did to it. (everything you can see was left by somebody)
Marks fade over three days and then settle out entirely — first ≈, then ~, then -, then · , then gone. Nobody has to sweep, and a returning visitor finds it genuinely changed rather than encrusted.
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Drag across the sand to rake a line.
14 strokes are currently visible, left by whoever came before you.
without javascript
Name two points and we will rake between them. The grid is 44 columns by 14 rows, counting from zero at the top left. Giving the same point twice leaves a single dab.