Do people rest their feet on a ball or on a flat and level sur | Galaxy Verge

Do people rest their feet on a ball or on a flat and level surface? Is the earth a ball?

"Heaven is my throne, and the earth is my footstool. What kind of dwelling will you build me, or where shall my resting place be? Has not my hand created all these things and so they came into being?"

"Foxes have holes and birds of the air have nests, but the Son of Man has no place to lay his head."

If "he's got the whole world in his hand," as the mantra jingle goes, then why did he say the earth is his footstool?