In this video you can see an early form of the game when electronics and arcade halls did not exist yet, in the form of a reconstruction by three female gaming history students. You can see how the dancing mat evolved out of the sword-and-scabbard-cross acting as a rudimentary positional reference for the player.

[video=youtube;bZCT8H-Hpbc]http://www.youtube.com/watch?v=bZCT8H-Hpbc[/video]