Shemini Atzeret (Convocation of the Eighth Day, Lev. 23:33–36, 39–43), the day following the seven days of Sukkot (Feast of Tabernacles or Booths), and Shavuot (Pentecost) are “buddies.” The symbolism of one is mirrored in the other. What happened on Shavuot throughout the Bible is a “shadow,” a likeness, of what will happen on a Shemini Atzeret during the Day of the LORD.
Spirit beings need God’s breath, “water” from the God and the Tree of Life. We will experience seeing God face to face, and we will be able to keep His commandments without any hinderance. He will be our Father, and we will be His children in fullness. We will “look like” God, which was God’s intent all along.