Flowering Cactus

At close to midnight yesterday, one of my cacti flowered! It has flowered before but that was last year. To see this flower is rather rare for me. It's either I missed it or did not realise it at all! It is beautifully strange that cacti would choose to come to full bloom in the middle of the night. The flower would usually last for the night and withers come day break. However, this particular flower remained in full bloom for the rest of the today! Cacti never stop to amaze me!

Here are two of the pictures I took last night.