Final answer:
Sam is using the overlapping cue when he sees parts of the next house behind the first house in a painting.
Step-by-step explanation:
Sam is using the overlapping cue when he sees parts of the next house behind the first house in a painting. Overlapping is a pictorial cue that occurs when one object partially covers another, indicating that the covered object is closer to the viewer. In this case, the overlapping of the second house by the first house suggests that the first house is intended to be seen as closer to the viewer.