I imagine the fire in the sky at night and white cloud in the blue sky during the day.
Exodus 13:21-22 (English Standard Version)
21And(A) the LORD went before them by day in a pillar of cloud to lead them along the way, and by night in a pillar of fire to give them light, that they might travel by day and by night. 22The pillar of cloud by day and the pillar of fire by night did not depart from before the people.
In Leviticus 6, the LORD told Moses to keep the fire going on the alter.
Now they are staying in one spot and they still see the fire at night and white stuff in the sky during the day.
Leviticus 6:9 (ESV)
9 “Command Aaron and his sons, saying, This is the law of the burnt offering. The burnt offering shall be on the hearth on the altar all night until the morning, and the fire of the altar shall be kept burning on it.
I imagine fire at night and white smoke in the sky during the day.
I love it!