When the children of Israel wandered in the desert, God provided for ALL their needs, even shade in the day and warmth and light for the night!
Perhaps talk about the moment when the cloud turned to fire and the fire turned to cloud. Ask them what do they think it would have looked like. Would they stop and look and call out that the pillar transformation was happening? We don’t always need to “teach” a lesson, sometimes we can just spend time with the children being in awe of the things God has done.