Some of my Gymnocalycium cacti started blooming

This pic is of a big boy that looks a bit like a lophophora underneath the flower, and here's one of an amazing grafted ball of fun I got last year (rootstock is slightly sun bleached, but quite healthy otherwise):

Looking forward to more and bigger flowers soon!

Edit: one of my gymno triplets also started to bloom some time between 3 hours ago and now! I was hoping all flowers would open up together, but it's still pretty :)