Danish modern chairs have several distinctive characteristics that even untrained eyes can easily distinguish. The Danish style avoids hard lines and geometric shapes, tending instead to graceful ergonomic curves that fit the body naturally. Danish chairs usually are made of lightwood, although darker pieces were later produced at the wish of consumers. Often the wood used is birch, oak, ash, or beech; their clean lines are usually devoid of extra adornment, finished with oil or wax. For fabric, natural colors with texture are the norm, and any patterning is minimalist. Another distinctive feature of Danish modern style is the open space left underneath its chairs and couches; long legs support them, not the short legs that are common elsewhere, leaving little to no space between furniture and floor.