A concept from Spain's Zana design lets users walk inside a wheel that leaves messages along the seashore.

Zana Design, a Spanish design consultancy heavy into conceptual projects, created a large wheel that users walk inside of (think hamster-wheels for humans) to inscribe messages onto the sand.  Zana designed the ‘Sand-Printer' with the intention to help spread democratic messages that uplift Spain's 1812 proclamation, but we think that its purpose can be further expanded – like inscribing the beach with advertisements, marriage proposals, temporary novels, etc.

They explain:

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