I like the way Baroque paintings used some of the methods of abstract art, yet the works were not too far over the top. You can look at most of the art from the period and you know what you are looking at. You don't have to guess what the images are, but the images on the canvass don't necessarily belong together.
This article uses the example of "St. George and the Dragon" to explain art from this period. This piece is not what we would call abstract in today's world, but the image of the princess is out of place on the battle field, so the symbolism is there.