The Tabernacle was a visible symbol of God’s presence among his people (Ex 25:8). This was a blessing not to be under-appreciated. When Adam and Eve were thrust from Eden, they were thrust from the presence of God. The Tabernacle was the first step toward God dwelling with his people once again.
Interestingly, it seems that all of the furniture described in Exodus 25 reinforces the concept of God’s presence.
The ark is the first piece of tabernacle furniture mentioned. It is the "supreme post-Sinai symbol of the Presence of Yahweh" (Durham, 350 cited by Enns, 511). Since Scripture reveals that Yahweh was enthroned between the cherubim (1 Sam 4:4; 2 Sam 6:2; Ps 80:1; 99:1), the ark, with the cherubim on its lid symbolizes Yahweh’s throne.
The table also testified to God’s presence with his people. The twelve (=tribes) loaves of bread laid on the table were called "bread of the Presence" (ESV, NASB, HCSB, NIV; "shewbread," KJV; Heb, לחם פנים). Leviticus reveals that the priests were to eat this bread each Sabbath in the Holy Place, which probably indicates God’s fellowship with his people.
The lamp is made to look like a tree, and several commentators think the lamp is meant to symbolize the tree of life (Staurt is the most helpful on this point; he makes the best use of cross references).
If the lamp does indeed picture the tree of life, the Holy Place and the Holy of Holies was like a miniature Eden built in the wilderness [G. K. Beale has some similar ideas in The Temple and the Church's Mission, but he argues Eden was a "temple." I think this argues backwards; the tabernacle and temple were like Eden]. This is an Eden that is also a continual reminder of sin, however. The people are still barred from the Holy Place and the Holy of Holies. Only priestly mediators are permitted to enter there.
Frame says the biblical story "is the narrative of God coming to be with his people as their Lord, in his control, authority, and presence" (DCL, 273). The construction of the Tabernacle is a major step toward the realization of God dwelling once more with man. It also reveals the need for the remainder of the plan of redemption.