h a l f b a k e r y
The word "How?" springs to mind at this point.
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Use compressed air on a 3d gantry to sculpt sand. ( or excavate building foundations. )
Perhaps carving heart shaped things in the sand.
A air digger in action.
Wear a dust mask! [popbottle, Feb 13 2017]
||Weird. I just watched that exact video the other day.
||An additive version might use that new product I heard about Brown 25.