In the modern world, a "cloud cuckoo lander" is defined as someone who is seen as "crazy" or "strange" by most average people, often doing or saying things that seemingly only make sense to themselves, but also exhibiting cleverness at times in ways no one else would think of.
It was an imaginary place of extreme luxury and ease where physical comforts and pleasures were always immediately at hand and where the harshness of medieval peasant life did not exist.
Aristophanes, a Greek playwright, wrote and directed a comedy, The Birds, first performed in 414 BC, in which Pisthetaerus, a middle-aged Athenian, persuades the world's birds to create a new city in the sky to be named Νεφελοκοκκυγία (Nephelokokkygia) or Cloud Cuckoo Land[2] (Latin: Nubicuculia), thereby gaining control over all communications between men and gods.
Author Edward Crankshaw used the term when discussing the Deák-Andrássy Plan of 1867 in his 1963 book The Fall of the House of Habsburg (Chapter 13, "The Iron Ring of Fate").
"[5] Bernard Ingham, Thatcher's spokesman, who, when asked if the ANC might overthrow the government of South Africa by force, replied: "It is cloud-cuckoo land for anyone to believe that could be done".
An Inquiry into the General Welfare, Wallace describes a cartoon in a popular weekly magazine which "pictured an airplane in an endurance flight refueling in mid-air, and made fun of the old fashioned economist down below who was saying it couldn't be done.
Wallace wrote that Wall Street's practice of lending money to Europe after World War I "to pay interest on the [war reparations] debts she owed us and to buy the products we wanted to sell her ... was the international refueling device that for 12 years kept our economic aeroplane above the towering peaks of our credit structure and the massive wall of our tariff, in Cloud-Cuckoo Land".
An iconoclastic, mixed-genre world where there are no rules or unhappy things and serves as a hidden base for the rebel protagonists and councils of Master Builder.