Blocks by Milton Glaser, 1965
If you are into the arts, I highly suggest you read "Then Things I Have Learned" by the wise and great Milton Glaser.
"...I also believe that drawing works in the same way. I am a great advocate of drawing, not in order to become an illustrator, but because I believe drawing changes the brain in the same way as the search to create the right note changes the brain of a violinist. Drawing also makes you attentive. It makes you pay attention to what you are looking at, which is not so easy."