Adding or Subtracting

I am fascinated with the idea of adding or subtracting. Have no fear, I am not talking about math, just hang with me for a moment.....I remember the exact moment this occurred - I was at an artist's talk being given by local sculptor Iain Fraser.....someone asked him if his process was completely additive.....to which he replied, "yes" and then talked about that for awhile. I listened with one ear as I pondered my own process.
To be honest, I had never thought about this before as it seemed a little esoteric. But the more I pondered (and yeah, I get totally obsessive this way, especially in the middle of the night, ha!) the more I came to understand that my process is both Additive and Subtractive. Very strange for a girl who has never enjoyed Math.

"Happy Birthday Mr. Turner" 30" x 30"

(You can click on both of these images to enlarge, by the way)

"Ode to a Wall" 24" x 18"

These are my most recent explorations. There is a lot of additive followed by a lot of subtractive including use of a palm sander, distressing down into the layers......plus, the white squares were carved out of the finished piece, back to the white of the Claybord - don't the squares look like confetti? I will confess that the palm sander was slightly scary and I felt out of control during that part. But maybe that's a good thing?