Backdrop and Framework

noun

• Scenery hung at back of stage.
  • synonyms: background, backcloth

noun

• A hypothetical description of a complex entity or process.
  • usage: "the computer program was based on a model of the circulatory and respiratory systems"
  • synonyms: model, theoretical account
• The underlying structure.
  • usage: "providing a factual framework for future research"; "it is part of the fabric of society"
  • synonyms: fabric
• A structure supporting or containing something. .

• (n.) The work of framing or the completed work; the frame or constructional part of anything; as, the framework of society.
• (n.) Work done in or by means of, a frame or loom.