I've just realised what this is. On the face of it, it is a child's puzzle; but I have just recognised the same pattern under the desk here, and realised it is actually grown-up training.
If you learned it properly you could sort out the wires for the keyboard, the mouse, the screen, the router, the computer gubbins, the scanner, the speakers, the desk lamp, the Skype camera, the mobile phone connections, the digital camera, and the wee machine that puts the tape recordings of Mr McCallum reading into digital files - most of which have two sets of wires.
Of course, the illustration does not reflect all the challenges - for example, I want a speaker on either side of the desk. And it does not show a demented human being in the middle of it all.
BUT IT DOES EXPLAIN WHY THREE MONTHS AFTER THE HOUSE WAS REWIRED MY PRINTER IS STILL NOT CONNECTED UP IN ANY WAY THAT WILL LET IT WORK.
I obviously did not do enough of these puzzles as a child. (And no, I have no idea who Mordecai and Rigby are.)