Illustration Friday is a weekly online challenge for illustrators of all levels to exercise their minds and show off their work. A topic to illustrate is posted on the IF site each Friday, then artists have one week to submit their interpretation. I haven't entered for a long, long time, but when I saw this week's topic "subtract," I was intrigued and came up with this.
The heart/vessel tree imagery has been a part of my work for about ten years— it came from a dream I had in which my blood vessels grew out of my arms into trees. About two years ago, a small, harmless hole was found in my heart which inspired me to carry the theme a little further, as you can see: