What does the absence of chairs in the tabernacle signify?
The absence of chairs signified that the priests' work in the tabernacle was never finished; they had no place to sit because their labor continued. By contrast, Christ finished His work and sat down at the right hand of the Majesty on high, as Hebrews 1 declares.
Les explains that all the materials and aspects of the tabernacle picture Christ in some aspect of His finished work. The sanctuary had no windows, and there were no chairs—not a single place to sit down. The work of the priests was never done and never finished, so they could not sit. But when Christ finished His work, He sat down at the right hand of the Majesty on high, because His work was finished, as Hebrews chapter 1 says.
Who being the brightness of his glory, and the express image of his person, and upholding all things by the word of his power, when he had by himself purged our sins, sat down on the right hand of the Majesty on high;