|Exposure: Aperture F3.5|Shutter Speed 1/4s|ISO 1600|
At night where there's not much light, we recognize our surrounding by shape, this is not perfect image to speak, but it does show how shape helps us to recognize things.
Thought process: I don't have second thought on this, the cat was sitting on top of the wall, and I quickly used my torch to illuminate the cat from the left to form strong shadow, another hand picked up the camera and click, the cat moved around quickly after that. I don't get the correct exposure here but it does deliver what I have in my thought.
By the way my friend said it is a giant snail, I can only wish if the snail has tail if he is right ;)