This is a Cactus "house plant" that I've grown since the 80's.
Each year, it blooms more and more profusely.

The first time that it bloomed was back in the late 90's with one single flower. For years after that, it only produced one flower at a time. Eventually, the number of blooms gradually increased.

Now, here it is today. This is the second display that this cactus has put on in 2015.