An amazing visual and interactive toy. <br> Nano scale magentic particles , Ferrofluid, are suspended in a transparent liquid and becomes highly magnetized in the presence of a magnetic field. <br> An effect from outer space. <br> Using the the incuded magnets to move the ferrofluid around the bottle, you observe the unique behaviour of this special substance. <br> Be amazed as the black liquid shifts, dances and morphs whilst creating unique shapres and patterns. <br> An an addictive and intriguing desktop accessory <br>