It's kind of impossible to tell the whole story with David Littler's Yan Tan Tethera show. Everyone in it had doors opened into their own heritage, whatever that was..Roswitha Chesher made a film which skimmed the surface of the project with great depth, here http://www.textilefolksong.co.uk/
Apply to something, Knit to open, knit to close. Here is a pattern for a door. A paneled door, option one, one way up; option two, the other way up. Work in one, two or more colours.
Taken from my pattern book of knitted charms, made for Yan Tan Tethera at Cecil Sharp house with David Littler 2014. From the song, 'Off Jumps Jack.'