How often do we suspect that there is more going on in Bach’s music than meets the ear?
Well, a mathematical image-maker Jos Leys has managed to show visually how the first canon from Bach’s Musical Offering looks as it crawls its way first forward, then in reverse, then in both directions at once! Luckily we only have the odd fugue to contend with in the guitar/lute repertoire of Bach and we can play more than two strings simultaneously, unlike viola da gamba players.

Many thanks to Nigel Warburton for passing this on.