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A cloud is a visible mass of water droplets or frozen ice crystals suspended in the atmosphere above the surface of the Earth or another planetary body. Clouds in the Earth's atmosphere are studied in the nephology or cloud physics branch of meteorology. Two processes, possibly acting together, can lead to air becoming saturated: cooling the air or adding water vapor to the air. Generally, precipitation will fall to the surface; an exception is virga which evaporates before reaching the surface...

Giuliano Mauri was born in Lodi Vecchio in 1938. He owes his fame to his many poetic environmental works, which are referred to as “natural architectures”. He took part in the Venice Biennale in 1976, in the Triennale in Milan in 1992, and in the Biennale in Penne in 1994. Working with branches and logs, he builds fantastically real buildings...

Reuel Golden, a former executive editor of PDN, has worked with art publisher Benedikt Taschen to produce New York: Portrait of a City. Setting out to be the visual encyclopedia of all things New York, Golden’s book collects hundreds of iconic images from early 1900 to present day. This book presents the epic story of New York in photographs, photo-portraits, maps, and aerial views—nearly 600 pages of emotional, atmospheric images, from the mid-19th century to the present day...

A microscope (from the Greek: μικρός, mikrós, "small" and σκοπεῖν, skopeîn, "to look" or "see") is an instrument used to see objects that are too small for the naked eye. The science of investigating small objects using such an instrument is called microscopy. Microscopic means invisible to the eye unless aided by a microscope. There are many types of microscopes, the most common and first to be invented is the optical microscope which uses light to image the sample...

A bird's-eye view is an elevated view of an object from above, with a perspective as though the observer were a bird, often used in the making of blueprints, floor plans and maps. It can be an aerial photograph, but also a drawing. Before manned flight was common, the term "bird's eye" was used to distinguish views drawn from direct observation at high locations (for example a mountain or tower), from those constructed from an imagined (bird's) perspectives...