ASB GlassFloor makes a glass playing surface for sports arenas that can show animations, track athletes' performance, and repaint court lines with a tap. Pros in Europe are already playing on it.

I stood on an indoor basketball court in Orlando, Florida, in mid-May, ball in hand and LeBron 15 sneakers on my feet, ready to run some drills.

My instructor drew up a basic diagram for me to follow in my next drill using an iPad. He showed how he wanted me to start at the baseline, then curl up to the corner of the free-throw line before taking a pass and driving to the basket. Easy enough to remember.

Here’s the thing, though: I didn’t have to remember any of the words he spoke or any of the lines he scribbled. That’s because, as he drew on his iPad screen, his diagrams simply appeared under my feet. Anytime he wanted to change or remove the drill, he simply tapped the iPad’s screen, and everything on the floor changed instantly, illuminating my new route.

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