If you want to see what beautiful is, this is it.
The body of Michelangelo's David is true to the human form and exudes youth and vitality. Not only does it boast accuracy of the human form, it also delivers the emotions flowing through David in the moment preceding his killing of Goliath. His gaze is intent on the goal ahead, his left foot grips the earth beneath it, as if the moment before push-off. His chest and ribcage suggest deep breathes and nervousness as they are drawn inward to be released in a deep exhale. His right hand grips the stone that will fell his enemy, but in an awkward way, indicating thought or nervousness behind the action, a nervous twitch or stance as he summons the courage.
This sculpture is just seriously impressive.