made flying cars (feiche) with wood from the inner part of the jujube tree, using ox-leather (straps) fastened to returning blades so as to set the machine in motion." British scientist and sinologist Joseph Needham concludes that this is a description of a helicopter top, because "'returning (or revolving) blades' can hardly mean anything else, especially in close association with a belt or strap." The Italian polymath Leonardo da Vinci designed a machine known as an "aerial screw" with a rotor based on a water screw. The Russian polymath Mikhail Lomonosov developed a rotor based on the Chinese toy. The French naturalist Christian de Launoy constructed his rotor out of turkey feathers. The English aerospace engineer and inventor Sir George Cayley, inspired by the Chinese top in his childhood, created multiple vertical flight machines with rotors made of tin sheets. French engineer and inventor Alphonse Pénaud would later develop coaxial rotor model helicopter toys in 1870, powered by rubber bands. One of these toys, given as a gift by their father, would inspire the American inventors the Wright brothers to pursue the dream of modern flight. Hell money: Hell money is a form of joss paper printed to resemble fake legal tender bank notes. The notes are not an official form of recognized currency or legal tender since their sole intended purpose is to be offered as burnt offerings to the deceased as a superstitious solution to resolve their ancestors financial problems. This custom has been practiced by the modern Chinese and across East Asia since the late 19th century. Hill censer: The hill censer, a vessel used for burning incense, dates to the Han Dynasty (206 BC – 220 AD). The censers are shaped like mountains and were used for religious rituals. The shape of the hill censer acts as a visual aid for envisioning the sacred mountains that were said to have been inhabited by Taoist immortals. Hill censers were originally designed for Taoist rituals, but were later used by Chinese Buddhists. Hill censers often include carvings of wilds animals and birds. Some censers depict waves at the foundation of the vessel, said to be the waves of the East China Sea. A hole at the top of the censer releases the smoke of the incense. Horse collar: A significant improvement of the ancient breast harness was the horse collar. The horse collar was depicted in a Northern