Sportvision creates its on-screen graphics, like the "Virtual Yellow 1st & Ten" line, with infrared sensors attached to uniforms and positioned around the stadium. The line shows viewers how far the offense has to advance the ball to earn a first down.
These days, you'd be forgiven if you're more excited about watching the "big game"—whether that's football, basketball, hockey—on TV rather than from inside a sports arena.
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