A Jeff Koons may go for $23 million, but your kid's artwork is priceless.

Let him create over and over again with The Spaceframe, innovative building blocks designed by Scott Klinker for Offi. Make a fort, theater or the next great sculptural statement of our time with the large green polyester panels (made of recycled soda bottles) of varying sizes. The modular system lets kids think in 3-D in ways Legos never could.

Give those modern art mavens a run for their money.

Available online at spunkysprout.com.