3.5.12 Beautiful flowering cactus

I thought it was the 1st time I see this cactus flowering, but discovered that one year ago, it did the same.

The following ones were pictured on 10.6.12, one of the very few days in June this year where 4 of our cactuses were flowering at the same time, but not necessarily together. Some opened only in the afternoon. It makes a feeling of such a colorful summer!