Like most numbers in the Bible, "six" can have various meanings depending on context, but has a couple that are primary. When used in relation to time -- six days, six hours, six years, etc. -- six generally represents a state of labor, struggle and conflict, especially the conflict involved with spiritual growth. The six days of creation, for instance, represent the stages we go through in our lives, working toward the peaceful seventh day, in which our evil desires are removed from us and we can rest. In most other references, six represents all desires for good and all the true ideas that come from those desires for good -- or in the contrary sense, all evil and all the resulting false thinking.

'Planks' or 'boards,' as in for the tabernacle, signify supports from good, because they were made of wood, and supported the curtains both of the tabernacle and the tent, as in Exodus 26:15-29. As far as all the representations in nature refer to the human form, and have significance according to that reference, and so they have the planks of the Tabernacle. These correspond to the muscles or flesh of a person, which supports the surrounding coats and skin.

(Odkazy: Arcana Coelestia 9634)