Is this a simile or a metaphor?

“Together the snakeskin and the aquarium made an interesting scene on the forest floor. It looked like an exhibit at a trial- circumstantial evidence- of a wild scene, as though a snake had burst through the broken side of the aquarium, burst through his ugly old skin, and disappeared, perhaps straight up in the air, in a rush of freedom and beauty.”
It's comparing the scene of the snakeskin and the aquarium with a exhibit at a trial of a wild scene, but i cannot figure out if it is a simile of a metaphor.