"Having developed at a time when cultures were profoundly dependent on their environment, Ayurveda uses language derived from nature as a metaphor to describe and prescribe for our health. According to its teachings, the foundational elements of Ether (or Space), Air (or its most dynamic aspect wind), Fire, Water and Earth are the building blocks that make up our physical world. We use adjectives to describe these elements as they appear in different forms, which Ayurveda depicts as ten pairs of opposing qualities (known as gunas) [[w:Hot|hot, cold; heavy, light; dry, greasy; sharp, dull; rough, smooth; stable, mobile; soft, hard; liquid, solid; subtle, gross; slimy, non-slimy."