Taijitu seen in Tripilja culture in Ukraine, displayed in the Ukraine pavilion at the Expo 2010 in Shanghai, China. Also, the interlocking design is found in artifacts of the European Iron Age. While this design appears to become a standard ornamental motif in Iron-Age Celtic culture by the 3rd century BC, found on a wide variety of artifacts, it is not clear what symbolic value was attached to it. Unlike the Chinese symbol, the Celtic yin-yang lack the element of mutual penetration, and the two halves are not always portrayed in different colors. Comparable designs are also found in Etruscan art.
Neo-Confucianism views within the neo-Confucian community, but overall, a system emerged that resembled both Buddhist and Taoist (Daoist) thought of the time and some of the ideas expressed in the I Ching (Book of Changes) as well as other yin yang theories associated with the Taiji symbol (Taijitu). A well known neo-Confucian motif is paintings of Confucius, Buddha, and Lao Tzu all drinking out of the same vinegar jar, paintings associated with the slogan "The three teachings are one!" While neo-Confucianism incorporated Buddhist and Taoist ideas, many neo-Confucianists strongly opposed Buddhism and Taoism. Indeed, they rejected the Buddhist and Taoist religions.