Something I found interesting this semester in psychology that will stay with me is visual perception. Perception is defined as the brain's interpretation of raw sensory inputs. And with that perception our brain can play "tricks" or illusions, perception in which the way we perceive a stimulus doesn't match reality, on us.
This looking like a broken road of lava, when in reality it was done with chalk.
Along with illusions the opponent process theory, which is the theory that we perceive colors in terms of three pairs of opponent colors: either red or green, blue or yellow, or black or white. I know that i've experienced it before when I would stare at something for a long time then close my eyes, but I never understood why I would see the certain colors when I did close my eyes.
Lastly, I will remember learning about bistable images, one we can perceive in two ways, like The Necker Cube. For some people it's easier for them to shift from looking at an image one way and then switch to the other way. I was always told that you would see an image one way if you were "left brain" and another image if you were "right brain" as you see in the video clip bellow. With the left-side of the brain is considered to be adept at tasks that involve logic, language and analytical thinking and the right side of the brain is best at expressive and creative tasks.