Common in Victorian homes, pocket doors slide into a cavity within the wall when opened. This fuctionality has been used for architectural effect and as a practical solution for areas without enough room to accomidate opening a hinged door. Pocket doors are commonly suspended from an overhead track, although there are instances of floor channel door guides. Depending on entry width, single or double doors can be used. Installing a single pocket door rather than a hinged door can add an average of ten square feet of floor space.