The image below (whose quality is not that good but for masonic purposes it is enough - otherwise its byte size would have been too high) reproduces a work by an italian painter of the XVI century, Caravaggio.
The title of the picture was «amor vincente», which translates into «winning cupid».
The mainstream assumption is that it follows a common pattern which involved, in that century, that any work portraying Cupid should also include musical instruments along with the bow and the arrows.
What is really puzzling is that any Freemason would immediately realize that these alleged "musical instruments" seem to include some tools that are not musical at all. If you watch carefully (and if you focus your mouse over the image it will magnify this particular), you will notice that at the feet of Cupid there are at least two tools that cannot be related to music to any extent... I might be wrong, but wouldn't you think that there are there right a... square and compass?
As far as we know Masonry was not developed in the XVI century, so I think we should assume it is a coincidence. What is puzzling is that:

• Neither square nor compass are related to music to any degree. Why are they there then?
• Caravaggio [one of the most controversial character of the Renaissance, whose alleged bad temper seems being legendary] was neither a musician nor a craftsman: he was a painter. Why & what are then those symbols there for?
• We have a double coincidence: we have not just the square or just the compass: we have both.
  The compass opening appears being 45°

Weird, isn't it?