Three of a Kind
This is an Epicactus hybrid. The "cups" being about 10cm diameter.
These were shot in shade, except the last. The twiggy background of the first image more closely resembles the natural habitat of the parent species of the hybrid.
The stereos are crosseye.
Olympus EM-1, (aperture priority), Olympus 4/3 50mm f2 macro, 1/40 f11 ISO 800, 1/13 f9, 1/15 f10, 1/320 f13 ISO 320, hand-held.