Some pictures of cats in enclosed spaces:

If you look closely, there’s a sign that says “NFS”. That means “Not for Sale”; the picture was taken outside a pet shop.

This was taken at Books Actually where the cats are super manja.
BONUS:

Not exactly a cat in an enclosed space, but still cute, nevertheless.
And… the references if you don’t get them:
- “Bullet with Butterfly Wings” by The Smashing Pumpkins
- “The Tyger” by William Blake.