Orange (colour) philosophy of ancient China, orange was the colour of transformation. In China and India, the colour took its name not from the orange fruit, but from saffron, the finest and most expensive dye in Asia. According to Confucianism, existence was governed by the interaction of the male active principle, the "yang", and the female passive principle, the "yin". Yellow was the colour of perfection and nobility; red was the colour of happiness and power. Yellow and red were compared to light and fire, spirituality and sensuality, seemingly opposite but really complementary. Out of the interaction between the two came orange,
Colour centre cannot track the actual firing of neurons, which happen on a millisecond timescale, but it can track the haemodynamic response, which happens on a seconds timescale. This method is ideal for tracking colour selective neurons because colour perception results in a visual after-image that can be observed in the neurons, which lasts about 15 seconds. Sakai et al. used fMRI to observe whether activation of the fusiform gyrus correlated with the perception of colour and the after image. The subjects in the Sakai study were placed in the fMRI machine and were subsequently subjected to various visual stimuli. A series