Remember the Vortex Dome? It is an amazing desk toy that puts on a mesmerizing display when spun. This Handmade Rheoscopic Fluid Dome is a tad bit larger. It measures 32 x 4 cm and comes with ball bearing required for the spinning mechanism. You can spin this with hand or using a strong magnet.
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HANDMADE Rheoscopic Fluid Dome Desk Toy (32 x 4 cm) - Kalliroscope ► Gadgetify
This particular version weighs about 3kg. You can find smaller versions on Etsy.
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