The Schlumbergera is flowering now, brings back memories of my youth and the big schlumbergera in a small room.
We were not allowed to touch it

Schlumbergera is a genus of tree-dwelling cactus from Brazil introduced to Europe by the Kew collector, Allan Cunningham in 1816.

They are tropical rainforest epiphytes, growing on tree branches where,
despite the high rainfall, water drains off quickly so that "dry" conditions prevail much of the time.
Not surprisingly these cacti are quite different in appearance from that of their desert-dwelling cousins.