This photo below seems to be a schematic of how creature containers are made by Martians in extreme antiquity. The reason I believe they are so current, is because the Martians live underground and they want to tell stories in (outside floor sculpture form) of their sorrows, in loosing most of their creatures when Mars was hit with a gigantic calamity that ruined their atmosphere and forced them to go underground. That is way you see all the millions of segmented objects, especially in the Hazard cams, Nav Cams and more close-ups in the Mastcam! Notice how mesh-like inside of these representations. Notice where I explain with the "green" light bulbs to indicate the mesh like walls! In making these walls, the Martians couldn't use regular material that would be manufactured because the Martians lost billions and billions of creatures in the extreme past's catastrophe ! Of course they would make massive floor sculptures. Don't you think that was earthlings would do the same if we lost all of our billions of creatures due to a giant catastrophe that would end all our animal, mammal life?
Sure I don't know a lot of what their outside sculptures are, but it sure has become obvious to me, a lot is involving loosing most of their creatures in the extreme ancient past ! I think MEMORIALS in sculpture form, though not done in stone, but in a material that is easier to manipulate the material at hand. I think they are made out of an algae type of material but that is not written in stone (pardon the pun) !
The analysis I use for the photos and imagery are not mean't to be exacting, only to get you closer to understanding that there is intelligent life on mars (martians). Many of the rocks you may think are rocks, are in fact highly designed sculptures, mechanical objects etc.
Nasa is trying to leak out anomalous imagery with out of course talking about it public! Though most images have been doctored, Nasa is trying to humbly and quietly nudge us along with out going too public about it vocally. Though it is work and painstaking effort to find objects in the images that have not been altered in some way!