Taz is a very intelligent creature.
When we moved into our new house, the basement window was very high. He knew he wanted to be up there. It took him about 2 months to find a way to get up there to sit in the sill.
One there, he realized the drop ceiling tiles cam lower than the window. This allowed him about 2 inches to view into the ceiling above the tiles. He, I suppose, saw this creapy dark space as a wonderland.
It took almost a year, but he finally got a way up there.
He realized that by jumping onto the shelf in the litter box closet, he could stand on top of his cat carrier. There, he pushed yellow ceiling insulation over and made a hole just large enough for his body. This allowed him access to the ceiling. He now crawls around "inside' the ceiling, above the tiles. It's his secret spot so I can't bring myself to put a stop to it.

Fister is clearly a very savvy kitty. Love the pic of the tail!