The Buoy is designed to be off-balance, like its namesake bobbing device, though not as extremely as a Pilates ball; the idea is that the microadjustments you're continually making with your body are not annoying enough to be a hassle, but adequate to burn some calories. Also unlike a Pilates ball, the Buoy is height-adjustable.
Node Chair: storage base for backpacks, swivel desk for right/left handed students ( or to move it out of the way), tablet stand built into desk, on wheels for easy collaboration & movement. Available in 20+ colors! 21 Century Classroom furniture!