impasto. An Italian word for “paste” or “mixture”, impasto is used to describe a painting technique where paint (usually oil) is laid on so thickly that the texture of brush strokes or palette knife are clearly visible.
The setting of a narrative explains the time and/or place in which the story takes place. In sentence 2, (“The floor of the garage was covered in grease stains, and he was only adding to the mess.”) it describes the garage which is the place that this takes place in. I hope this helps you :)