for the same reasons that you outline, and more. One testable hypothesis, that I have not tested yet for a lack of computer graphing and VB skills, is that it seems to me that the distribution of spheres within the rocks is more than even. By that I mean that there are not enough spheres in close proximity, or in contact, or fused, than a random distribution would yield. It seems to me that very few are close together. The statistics could be derived for this. I wanted to simulate a box with spheres randomly placed with a narrow size distribution, and see if it looked like the rocks there. Some of the larger white domal Eagle Crater rocks were good targets for this analysis, I thought. There are not a whole lot of metrics that can be derived from these photos, but these size and space distributions are one.