Slicing and thrusting through the air to control a virtual sword. Flicking your wrist to roll a digital bowling ball. Striking an imaginary golf ball down a tree-lined fairway.
Until recently these living room experiences — using natural, intuitive human movements to control a video game — have been available only on Nintendo’s Wii console. Less powerful than Microsoft’s Xbox 360 and Sony’s PlayStation 3, the Wii has nonetheless become the most popular home console because of its simplicity. To play, people just need to pick up a little plastic wand and swing.