Call of the heart.
One of my all-time favorite stories from teaching comes from a project I did with Elementary school kids. This particular group belonged to the Art Club and we created a mosaic splashback for their art room with the theme of Under the Sea Creatures. One young boy in particular was especially drawn to the mosaic process. His panel in the mosaic was of a dolphin and every two or three tesserae he placed on the mesh backing came with the exclamation, "Oh my gawd, it's so gorgeous". To this day, I use that expression for myself when I am developing a new work. I train my adult students to take it on as well. It's so much fun to say. Try it.
In the midst of a commission and needing to handle some overdue paperwork, I find myself called to make a mosaic heart. What for?, my brain asks. For pleasure, I answer.