Like the Garden of Eden, the tabernacle is the place where divinity and humanity commune together.
But, since humanity is already affected by sin (unlike in Eden), so to meet a holy God, the people need to be sanctified from their sin and uncleanness.
And so, a portable bronze-plated altar, placed in the courtyard, is needed (
Ex 27:1-8).
It is 2.5 meters wide and 1.5 meters high.