> some of the images are positive and some are negative
It depends on the color of the rock underneath. When white dust is blown on a dark surface one might get the impression of a handprint rather than the outline.
It depends on the color of the rock underneath. When white dust is blown on a dark surface one might get the impression of a handprint rather than the outline.
Also, take a look at the hires:
https://upload.wikimedia.org/wikipedia/commons/f/f4/SantaCru...
A the top center you will see a couple of positives that overlap each other. How did that happen?