I think it is because the rubber backing of these stamps is sticky and tacky and that helps pull the paint off of the canvas. Anyway, I thought it was a cool texture. I love geometric shapes.
I am also very excited to be starting another online watercolor class with Michelle Brown. This time we will be painting Spring Flowers. Should be fun! We are studying and drawing the flowers now. If we don't understand the flower then it will be more difficult to paint it.
I will post a better picture of it soon--when I get over to my studio. Come back and see it.