The document compares two unique leaning buildings - the Leaning Tower of Pisa and Capital Gate in Abu Dhabi. It discusses the materials used, structures, and space usage of each building. The Leaning Tower of Pisa was constructed over 200 years using limestone and marble, while Capital Gate was engineered with a pre-cambered core to support its 18 degree lean. The Tower of Pisa has thick limestone walls and is located in Pisa, Italy, while Capital Gate has 35 floors, reaches 165 meters, and contains office and hotel space in Abu Dhabi. Both buildings showcase innovative architectural techniques to defy gravity through their intentional or unintentional leaning designs.