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.
whiteboard tables. (can use sherwin williams 'sketch pad' dry erase coating to incorporate color rather than white...@ http://www.sherwin-williams.com/homeowners/products/catalog/sketch-pad-dry-erase-coating/)
Why I Decided Getting Rid of My Classroom Furniture Was the Best Thing for My Kids