You can argue both ways. You sit on a chair and you sit on a toilet. Most chairs arent made out of porcelain, but you certainly could make one. A toilet howeve

You can argue both ways. You sit on a chair and you sit on a toilet. Most chairs arent made out of porcelain, but you certainly could make one. A toilet however serves a different purpose than a chair. This is the main definition that matters, because you can sit on a table or a roof, but those items are definitely not chairs.