What Are The Clouds Sitting On

What are the clouds sitting on? Carved castles Powerful shapes and delicate dollops But clouds are flat on the bottom. The clouds are flat on the bottom. They are like my great, great, great wrinkly old aunt Mildred. They must be sitting On an invisible something. A divide in atmospheric pressure? A mile-high, sky-top of our own human smog? Or the wall that the dragons fly above (But we cannot see them through this blinding shield) The clouds are sitting on top of Something invisible. What a lucky something, What a lucky us. Thank you for holding up the clouds.