An upside-down sketching technique..... literally an eye opening experience.
This puts the left brain in a state of confusion so that it can't easily decipher shapes, assign a top and bottom, attach labels and categorize them to match stored memories.
When presented with a confusing image, your more logical left-side of the brain gives up thus giving the intuitive, subjective, holistic right side has a chance to sneak in.
It's exciting to think that there are ways to outsmart our brains. By intentionally putting ourselves in a state of mental conflict, we can enhance our creativity.
Trompe-l'œil ~ trick the eye
Sometimes called illusionism, it's a style of painting which gives the appearance of three-dimensional, or photographic realism.... not quite achieved the desired effect here just yet....