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four domains (catur-dhātu, 四界). According to ancient Indian philosophy , matter is made of the four domains—earth , water, fire, and wind—which have four corresponding appearances: solid, liquid, heat, and mobility. Hence they are also called the great seeds (mahābhūta, 大種) with the four appearances as their self -essence, or changeless qualities. In fact, these appearances are the states of matter under prevailing conditions (see six domains).