Second Life enjoys unprecedented boom of popularity. Business in that and many other virtual worlds is thriving, as are social relations.

So what about blending the old world, which we habitually call "real", with the virtual ones?

Think video display on the inner side of your's glasses. Appropriately differentiated right/left eye video feed results in perfect 3D experience. Imagine a fine motion detector tracking your movements - left/right, up/down. A fast, realistic one; no silly delays.