The New Museum is on an inner-kid-friendly roll this year, first with worms and now with a slide. A 102-foot-long plastic tube, to be precise, connecting the fourth floor of the SANAA-designed museum to the second. Visitors can do more than touch the Carsten Höller artwork-they can suit up in helmets and pads and take the three-story slide for spin.

A new installation at Berlin's Museum for Contemporary Art, by Carsten Höller, will soon offer vistiors a chance to pay 1,000 euros to eat shrooms and sleep in a "floating hotel room on a platform shaped like a mushroom."