The greasy thumbprint by the tack sells this. Maybe it’s a shadow, but it doesn’t look right

  • Jojo, Lady of the West@lemmy.blahaj.zone
    0·
    21 days ago

    Even “clear” things cast shadows. If you can see it, it’s because some of the light is bouncing off and reading your eyes, so at least that much light won’t make it to the page