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from the vision research dept of mcgill university
the guy wasn`t crazy after all.
the construction of this tower began on august 9, 1173, and was finished over a 200-year period. there is controversy about the identity of the architect of the leaning tower of pisa. for many years the design was attributed to guglielmo and bonanno pisano, a well known twelfth century resident artist of pisa, famous for his bronze casting. bonanno pisano left pisa in 1185 to monreale, sicily. after the third floor was built in 1178, the tower acquired a lean, due to a mere three-meter foundation in weak, unstable subsoil. the design of this tower was flawed from the beginning. construction was halted for almost 100 years because the pisans were almost continually engaged in battles with genoa, lucca and florence. this allowed for the underlying soil to settle, otherwise the tower would almost certainly have toppled. only in 1372 was the last floor, the bell-chamber, built by tommasso di andrea pisano and bells finally installed. the tower is 55.863 meters (185 feet) in height, which is about 8 stories. it weighs about 14,700 metric tons.
