In Exodus 26:1, this signifies interior truths of faith understood with a new mind. (Arcana Coelestia 9595)
In Exodus 26:7, this signifies the outermost of innocent ignorance that was found among some of the gentiles. (Arcana Coelestia 3519[8])
In Numbers 4:25, this signifies the Word in its literal sense. (Doctrine Regarding Sacred Scripture 42)
In Jeremiah 10:20, this signifies truths that come from good and serve as a covering of the good. (Apocalypse Explained 799[11])
(References: Exodus 26; Jeremiah 4:20)