The Mishkan (aka Tabernacle) is an image of different things when viewed from different metaphorical angles: God, man, family, nation, and probably others.

The 3 layers of the Mishkan/Tabernacle coverings were each made of a different material: Goat hair, red ram skins, & takhash. Why those materials in particular? That's mostly unknown today, although many people have given it a lot of thought. Here's one idea: The layers progressed from refined to crude as you move outwork, but rare to common as you move inward. Value, glory, etc., are matters of perspective.

http://soilfromstone.blogspot.....com/2010/03/approach