Well, at the simplest level, the regolith here is not glued together like the "Magic carpet" at Gusev. It's loose enough that one can push the grains down into it. OTOH, it acts a mobile grain aggregate - if you push it, it moves aside and pushes other things. I combined the "before" and "after" microscope images of the regolith with rgb such that before=purple and after=green while things that didn't change stayed grey. This emphasises a few loose grains that moved in the untoughed part of the surface and the ones that moved a lot in the compressed part.

Remember that the Mossbaur plate vibrates slightly (or perhaps the effect is more like a gentle "hum". This will tend to compact loose grains quite well.

or with blue and red colours to make an "anaglyph"

If you like, you can try the 3D red/blue glasses but it just looks weird. What's better is to look at coloured fringes as indicators of movement. Red = before & blue = after. You can see that the large sphere at top right has moved up and right, while small nudules near the centre haved moved down and left - basically, everything is moving away from where the Mossbauer pressed hardest. Many of the nodules have been pushed down into the sand which has all-but closed over them. Some nodules have been pushed and rotated and have made a hole in the grain aggregate that has not closed (dark areas in the original image or patches of uniform red in the coloured one)

As for origins of things, spheres can form floating in the atmosphere from cooling liquids, although they may tend to get a bit distorted if they are falling through it or if there is wind shear.

Lots of questions must wait for answers until we see some more things - like a microscope view of the pale rock - is this formed of the same range of grain shapes as the grey nodules?

What is its bulk chemistry and Mossbauer spectrum?

Patience...