These are actually not that young anymore (ca. 15 months). They have changed for the second time and are the most unusual looking Lithops I've ever seen. I assume they will only get stranger with time so I'm really looking forward to it (strange is good!). The patterns vary a lot. Most have this steineckeana marble stone like lines and the color to match (pic 3, left) but several clearly show some pseudotruncatella heritage. Sometimes it looks like the steineckeana pattern was pulled open in the middle to show the pseudotruncatella undergarments (see pic 2 middle and pic 4 upper part). There's even a plant that has steineckeana shape and sides but a pseudotruncatella top (pic 5)! I find it quite interesting. Speaking of shape, don't they look like some sci-fi alien sandworms smiling at you out of their earthholes? Not a nice thing to say probably, but I think it's absolutely adorable. : )
Look at the plant in the left corner - the fissure is just a small dot.