Well, these are basically showing their mature features now, Also, kept in a humid container since I have a box that never goes below around 17 Celsius (and is artificially lit). In contrast, there is one corner of the box that I've been growing Ariocarpus retusus ssp. trigonus elongatus and they outgrew the pot in like 1 1/2 years (pictures eventually...though I do have to say I have yet to repot them...)
Which brings me to today's picture! A grafted Ariocarpus sp.! It can be one of two species, I sowed this one back in August. Grafted on Opuntia humifusa
Link: https://flic.kr/p/2czoagW