The answer is the horizon line.
The context of a work of art refers to the cultural constraints and expectations that surrounded and influenced the artist's creation.
I'd say the fourth option is the answer. It sounds the most sensible.
(I'm sorry if I'm wrong)
If we stare at a pattern for a sufficient amount of time, our brains will cause the pattern to spontaneously reorganize itself.
Many psychologists believed that humans' pattern recognition abilities exist to aid us in our survival. This ability make us able to quickly identify possible danger/occurrences from several sign, which will help us to produce faster fight or flight response.
