House Entrance Doormat

changing the state that which passes above it, such as a doormat attracting dirt from shoes.
In domestic settings:
A doormat is a flat, usually rectangular object placed immediately outside or inside the entrance to a house or other building, to allow people to easily scrub or wipe the soles their shoes before entering. Doormats are usually made from tough, long-lasting material such as coir, palmyra (palm tree) fibres and stalks, nylon, rubber, cloth, or aluminium and other metals. Doormats may also be known as welcome mats, as their location at an entrance constitutes a "welcome" to visitors, and may therefore also bear some word, message or sign greeting. This in turn has given rise to a subculture cartoons featuring characters returning home to find (to the reader) a humorous message on the doormat. The lowly purpose for which doormats exist has also led to informal use the term as a reference to people who behave timidly or passively when exploited by others (see also Caspar Milquetoast).