A Raisin in the Sun was considered a risky proposition when it was first produced on Broadway in 1959, dealing as it did with the story of an African-American family. The play proved to be a success anyway, helping launch not only Hansberry's career, but also that of actor Sydney Poitier. The play was the first on Broadway with a cast that had an African-American majority.

Beginning with his play 1982 play Jitney, August Wilson undertook a project to write one play representing each decade of the twentieth century that took on the African-American experience. All but one, 1984's Ma Rainey Black Bottom took place in Pittsburgh, often featuring members of the same family. Two of the plays won Wilson the Pulitzer Prize for Drama, 1987's Fences and 1990's The Piano Lesson.

Many critics and scholars group Blood Wedding, The House of Bernarda Alba, and Yerma as a trilogy, as they all deal with rural Spain and were composed from 1932 to 1936. Their author, Federico Garcia Lorca, had actually intended to write a third play to make a trilogy, and did not himself see The House of Bernarda Alba in the trilogy. Lorca was killed by Nationalist forces in the Spanish Civil War in 1936, for his activity on behalf of the Republican forces, which often was apparent in his writings.

John Guare emerged in the 1960s with a wave of other playwrights, but distinguished himself through wry humor and interesting narrative form, both of which he applied to conventionally dramatic stories. The House of Blue Leaves (1966) is a black comedy about nuns, the Vietnam War, and mental institutions that features many characters coming and going. Six Degrees of Separation (1990) tells the story of a con man's deception of socialites from the socialites' perspective at a dinner party.

A Streetcar Named Desire won the 1948 Pulitzer Prize in Drama for its playwright, Tennessee Williams. Largely considered one of the premier dramas of the twentieth century, the play's depiction of mental health problems, sexual desire, and violence was considered groundbreaking in its own time. The play would be made into an award-winning movie in 1951 and firmly established Tennessee Williams as one of the largest figures of the theater world.

Arthur Miller won the Pulitzer Prize in Drama in 1949, David Mamet won the Pulitzer Prize in Drama in 1984, Eugene O'Neil won the Pulitzer Prize in Drama in 1922, 1928, and 1957, and Sarah Ruhl won the Pulitzer Prize in Drama in 2010. 

My Fair Lady, by Alan Jay Lerner and Frederick Loewe, is entirely based on the George Bernard Shaw play Pygmalion. The characters and story, featuring a flower girl taught to be a lady who speaks properly, are almost exactly the same in each play. The musical simply adds songs, and crucially changes the ending to a happier one that features the two main characters staying together.

Epicureanism takes its name from Epicurus, the Greek philosopher from the third and fourth centuries BCE, who argued for "pleasure" as the goal for all human beings to reach transcendence. Epicurus did not strictly advocate seeking unadorned hedonism, but instead saw "pleasure" as best achieved through a moderate approach to life. Epicureanism was very popular in Classical Antiquity, but died out after the rise of Neo-Platonic and Christian thought in the third and fourth centuries CE.

In the Bible, the books of Exodus through Deuteronomy tell of the departure of the Hebrew people from Egypt. The classic moment in this sojourn is their time at Mount Sinai. This is where the so-called Ten Commandments were said to be presented by God to Moses. Whatever might be the historical accuracy of this overall tale, this is an important fact to know, as the experience of the Hebrew people in the desert was pivotal for their self-identity. This would remain a continuing motif throughout their scriptures as well as in the Christian scriptures as well, which would present Jesus as a kind of second Moses.

To most people, Thales is known for two things. On the one hand, he is known for his position that all things are made up of water. This thesis was an honest attempt to explain experience by experience alone. Water is involved in many things and processes, so it seemed to him to be a good candidate for what makes up everything in the world—letting one thing change into another.

He is also known for the story of how he was laughed at when he fell into a well. He is presented like this in the Theaetetus of Plato. This makes him seem like an airy philosopher, who was staring at the stars without any awareness of his surroundings—"with his head in the clouds." In his Politics, Aristotle does tell at tale about how Thales put his knowledge to use to make a profit, so as to prove to the unbelieving that philosophy can be useful if need be. Be that as it may, the story from the Theaetetus is perhaps the best known story about Thales.

In the course of the discussions of the Republic, Plato uses the Allegory of the Cave to explain the nature of education (at least as he believes it is). The general idea is that education is a matter of conversion, turning the soul from false images to the actual reality of the truth. The Allegory tells the tale of prisoners, locked up in an underground cave, unable to move their heads, looking at shadows projected on the wall by others. They learn how to guess about the shadows but never even realize that they are just the projections of objects on sticks. 

Then, someone (i.e. a philosopher) comes along and turns a prisoner around, taking of his shackles. Forcefully, the philosopher shows that person that he has not been experiencing reality but instead has only been looking at shadows. He drags that person out of the cave so as show him what things really are. (Hence, the Allegory proposes that the philosopher teaches him about the way to see the ultimate truths of reality.)