The last time I took pictures of my Lithops fulviceps, I noticed something cool and - being me ;) - I took advantage of it.
I took some glowy, see-through photos of some of my Lithops.
As you might know (or not...) Lithops are plants that have their chlorophyll on the inside. In order for the light to get to these cells, they need windows or other openings on the outside. This is exactly what can be seen here.
It's very interesting how different these windows are in the different species. Some have huge, uniform openings beneath their surfaces, some have spots that usually look solid and dark and others have only slightly translucent areas without real windows.
Unknown Lithops from a seed mix