According to Wikipedia, the chair has been used since antiquity, although for many centuries it was a symbolic article of state and dignity rather than a functional item for ordinary use. Once chairs emerged beyond privileged status, they became ubiquitous in many cultures leading up to today where chairs are an integral furnishing selection for homes, offices, schools, restaurants, meeting spaces, theaters, and numerous other settings. Design considerations include durability, ergonomics, functional features (e.g. stackable or folding, task specific heights or styles, etc.), maintenance and, of course, design style.