Sketches in a secret room under a chapel, done by Michelangelo while hiding from the Pope

Why the fuck on earth is there a shadow but no person at the window?!

I find it hilarious to think that the pope was running around rome looking behind bushes and under beds to find michaelangelo:
*Pope sees a bulge behind a curtain*
‘AH-HAH, I a-got you, you penis drawing sinner’
*Just a statue*
*Pope shuffles away visibly upset*