To me Ariocarpus is one of the most fascinating of cactus genera. And though A. retusus isn't among the most rare of the group, it never loses its attraction to me. Last week it was blooming away, along with a beautiful blooming Lophophora diffusa nearby (not peyote [L. williamsii], which in the United States is illegal to possess!).
Interesting things continue to happen every day in the greenhouses. It may begin to feel like it, but it isn't winter quite yet!