See the sky as you never have before.

Using a series of his awe-inspiring images, photographer and scientist John Day, who has a Ph.D. in cloud physics and is known round the world as "The Cloudman", introduces us to Earth's great skyscape.

His spectacular portfolio of pictures captures a variety of cloud forms and shapes, ranging from cottony-soft cumulus clouds to frightening, whirling funnels, as well as a number of optical effects, such as coronas and halos, seen in the heavens above.

A magnificent cloud chart; an explanation of clouds formation; hints on forecasting, observing, and photographing clouds; and his "Ten Reasons to Look Up" teach us to use our inner eye to really perceive those familiar fleeting forms.