Make your own aqua sand- this stuff is SO COOL! The sand is waterproof and reacts to liquid in such a unique way, allowing kids to build amazing underwater castles and sculptures.

Make your own aqua sand- this stuff is SO COOL!  The sand is waterproof and reacts to liquid in such a unique way, allowing kids to build amazing underwater castles and sculptures.
Photo via: growingajeweledrose.com