the virtual first-down line in football, NASCAR’s racecar tracking system, baseball’s strike zone graphics and the virtual ads on the glass in hockey are all descendants of the glow puck.

For tracing, the puck is preferred because its crosshairs, visible through a clear glass lens, lets you precisely pinpoint ends and corners of detailed drawings. Most tablets allow parts of the ...

As such, up until now I've not being able to sample the delights of Sky Glass. That, though, looks like it going to change shortly, as Sky has just confirmed that its Sky Stream puck is being made ...