prism 
/ˈprɪzəm/ noun
plural prisms /ˈprɪzəm/ noun [count] : a transparent glass or plastic object that usually has three sides and that separates the light that passes through it into different colors — often used figuratively to describe a way of looking at or thinking about something that causes you to see or understand it in a different way ▪ The novel is a history of early 19th-century America told through the prism of one life.
