God's glory and his present, cloud

Exodus 40:17-38
Moses ad Aaron and his sons used it to wash their hands and feet. They washed whenever they entered the Tent of Meeting or approached the altar.
Moses finished the work. Then the cloud covered the Tent of Meeting, and the glory of the Lord filled the tabernacle.
So the cloud of the Lord was over the tabernacle by day, and fire was in the cloud by night, in the sight of all the house of Israel during all their travels.
When all is done, God signifies his satisfaction. The cloud, the visible token of God's presence, rests on the Tent, and the place is filled with the dazzling light of God's glory.
For 300 years, until it is replaced by the Temple in Solomon's day, God's Tent will remain the focal center of the nation's worship.
Why?
God present the cloud as His glory. Visible but could not touch it. It is come from somewhere we do not know, and go away like wind, like the Spirit of God.
God is the fire that give us the light and heat to warm us and warn us. The fire may burn the evil men and things but also give us the comfort living.
How?
God is great, He is the Lord, God is the fountain of blessing.