A stream of liquid sand flows from above and reacts with your shadow as if it were solid. Its hypnotic motion conjures childhood feelings of playing with water or building wet sandcastles. Like making shadow puppets, you can easily construct concave structures with your hands to catch the sand and then you can pour it from hand to hand or maybe into your friend's mouth.  Play with it long enough and you might discover some of its many secrets.  (Hint: Makes reference to "The Rainbow Goblins" by Ul De Rico).

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