Video: Hymnocalycium flower unfolds

Gymnocalycium anisitsii has been blooming in my house for the third year in a row, ever since it appeared on my windowsill. It is a store cactus, obviously of Dutch origin. I am distrustful of them, but this specimen definitely decided to dispel my doubts.

I have already shown its photos, and in the gallery of Gymnocalyciums it is presented almost from all angles. This time I decided to make a video of the opening flower for a change.

What happened in 2 seconds in the video took a total of about 2.5 hours.