So, as I put my 4 and 3 year-olds to bed tonight, they were yet again asking me about how God the Mommy/Daddy (as I refer to the first person), Jesus, and the Holy Spirit are all God. So I was thrust by my preschoolers into explaing the Trinity. I tried the old water as liquid, ice, and vapor, but I couldn’t go through with it because of the inherent modalism in that analogy.
Then I looked up. I saw the ceiling fan in their room. Three blades, one fan. We turned it on, and the three blades became…one fan.
I thought that was pretty good, off the top of my head.