Without a matrix circuit, a 61-key keyboard would require 62 wires to connect a keyboard (one for each note, and a ground) — an awkwardawkwardly thick bundle of wiring. With a matrix circuit, the all 61 keys can be scanned with only 16 wires. These can be drawn schematically as a "key matrix" of 8 column wires and 8 row wires, with a switch at every intersection. The electronic or digital keyboard controller scans all of the columns, to determine if a key has been pressed. If a key in the column has been pressed, then the controller scan the rows, to determine which row has been activated. In a manner analogous to the children's board game "Battleship!", the keyboard controller determines which key has been pressed, and then plays that key's note. This entire process takes place so quickly that the performer is not aware of the delay.<ref name="dribin">
