Greek engineer, physicist, and writer Philo of Byzantium (c. 280 – c. 220 BC) contains a description of gimbals used to support an inkpot that could wet a pen on any of its sides, yet Needham suspects Arabic interpolation and doubts total authenticity, while Belgian-born American chemist and historian of science George Sarton asserts that for the most part the Arabic translation is faithful to Philo's lost original, hence Philo should be credited with the invention of the gimbal. Around 180 AD, the Han Dynasty (202 BC – 220 AD) inventor, craftsman and mechanical engineer Ding Huan (丁緩) — who also created a rotary fan and zoetrope lamp—invented a 'Perfume Burner for use among Cushions', or 'Bedclothes Censer'. This incense burner had a series of metal rings which could be moved in any direction while the burner in the middle remained constantly level. This is the first clear reference in China of the gimbal, although there is a hint in the writing of the Western Han Dynasty Chinese poet, writer, and musician Sima Xiangru (179–117 BC) that this device existed in the 2nd century BC (i.e., 'the metal rings burning perfume'). The gimbal incense burner is mentioned in subsequent dynasties, while silverwork specimens of gimbal incense burners from the Tang Dynasty (618–907) still exist. In the Liang Dynasty (502–557) there is mention of gimbals used in hinges for doors and windows, while an unnamed artisan presented a warming stove to Empress Wu Zetian (r. 690–705) in 692 which employed gimbals to keep it constantly balanced. Go (board game) (圍棋 in Chinese): Although ancient Chinese legend (perhaps contrived during the Han Dynasty) has it that the mythological ruler Yao came down to earth from the Heavens around 2200 BC carrying with him a go board and stone player's pieces, it is known from existing literature that the go board game existed since at least the 10th century BC during the Zhou Dynasty (c. 1050–256 BC) and was even mentioned in writing by ancient Chinese philosophers Confucius (551–479 BC) and Mencius (371–289 BC), although the latter two had a slightly negative opinion of it. Goldfish domestication: In ancient China, various species of carp (collectively known as Asian carps) were domesticated and have been reared as food fish for thousands of years. Some of these normally gray or silver species have a tendency to produce red, orange or yellow color mutations; this was