Inspired by the ferrofluid art project “Protrude, Flow” by Japanese artist Sachiko Kodama, Concept Zero has created ferrofluid art pieces for the general public. Each glass bottle contains 2 ounces of a top secret solution (mostly water, plus some secret ingredients) and a generous glob of ferrofluid. Use the included magnets to move the fluid around. Simple to use, but so much fun! $29.99