Orange (colour) jackfruit tree. In Europe and America orange and yellow are the colours most associated with amusement, frivolity and entertainment. In this regard, orange is the exact opposite of its complementary colour, blue, the colour of calm and reflection. Mythological paintings traditionally showed Bacchus (known in Greek mythology as Dionysus), the god of wine, ritual madness and ecstasy, dressed in orange. Clowns have long worn orange wigs. Toulouse-Lautrec used a palette of yellow, black and orange in his posters of Paris cafes and theatres, and Henri Matisse used an orange, yellow and red palette in his painting, the "Joy of Living".
Expert for them to be accepted as an expert. In this respect, a shepherd with 50 years of experience tending flocks would be widely recognized as having complete expertise in the use and training of sheep dogs and the care of sheep. Another example from computer science is that an expert system may be taught by a human and thereafter considered an expert, often outperforming human beings at particular tasks. In law, an expert witness must be recognized by argument and authority. Research in this area attempts to understand the relation between expert knowledge, skills and personal characteristics and exceptional performance.