Ceiling fan be used to reduce the stratification of warm air in a room by forcing it down to affect both occupants' sensations and thermostat readings, thereby improving climate control energy efficiency. Punkah-type ceiling fans date back to 500 BC, and are native to India. Unlike modern rotary fans, these punkah fans move air by moving to and fro, and were operated manually by cord. The first rotary ceiling fans appeared in the early 1860s and 1870s in the United States. At that time, they were not powered by any form of electric motor. Instead, a stream of running water was used,
Dynamism of a Speeding Horse + Houses Dynamism of a Speeding Horse + Houses Dynamism of a speeding Horse + Houses is a sculpture from Umberto Boccioni realized in 1914-1915. It is now part of the Peggy Guggenheim Collection art museum in Venice. With this artwork Boccioni aims at representing his idea on the concept of space, according to which not being able to see the distance means not to be able to perceive it. As a consequence, a spinning horse and some houses in the background look to the observer as single dynamic unity. Umberto Boccioni sculpted "Dynamism of a speeding Horse + Houses" after publishing