If bits and pieces (and entire humans) could be dragged through the bars of Lucifer's Cage, then nothing is impenetrable.

"The Winchesters, I assume?" Castiel is rarely separate from the brothers. Michael understands the desire to flock, even if he doesn't get Castiel's taste for Sam and Dean Winchester, of all possible humans. He's only bumped into Dean thus far, but he doesn't expect Sam to be far behind. "I encountered Dean the other month. He's younger than he should be."

Michael makes mock casual conversation as he continues examining his surroundings. He's sure he's seen that cat make the same loop around the room it has at least twice now, just as sure as it seems blind to their presence. As it comes around for a third pass he leans down and scoops it up. He's expecting a reaction of some sort, but when lifted from the ground it's suddenly as limp and motionless as a corpse.

'Weird choice in decor' doesn't even begin to cover this place.