This rock-stacking simulator is enchanting and addictive

Neal Agarwal created this lovely and addicting rock-stacking simulator.

It delivers some of the meditative appeal of creating little stone cairns without the controversy. From National Geographic:

It's tempting to create your own as you travel, but that's not always a good idea: misplaced rock stacks can lead hikers off trail; endanger fragile ecosystems[…] or, if stones are pried loose for cairn-making, promote erosion.

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