Another Sage Moment

We went to dinner with Alan's family tonight. I took Sage to the bathroom and turned my back in the stall while he pooped. He likes his privacy, you know. So I am standing there waiting and I hear him say, "Hmmm, my poop is black today." The way he said it seemed to indicate that he checks this each day. I wonder what the color of his poop means to him. I should have asked.