When it becomes the cloud or evening, the flower is closed.
There is a rosy pattern in 3 outside petals.
Commonly known as the waterlily tulip, when sunny, the 6 petals open to form a beautiful star-shaped bloom.
early buds, just starting to open
Kaufmanniana Tulip 'Ice Stick' flowering in Keukenhof (Netherlands) on april 16th 2008.
Tulipa, Ice Stick - very early bloomer
This photo shows the epheremal bluish-streaking.