Where was Lingua Franca used?

En­ter­tain­ment games. Tarot deck was used from the 15th century in various parts of Europe to play a group of en­ter­tain­ment card games. It was adopted by mystics and oc­cultists much later, at the end of the 18th century.

An­ti-­fas­cist Pro­tec­tion Rampart. The name implied that West Germany had not been fully de-­Naz­i­fied. Before the Wall's erec­tion, 3.5 million East Germans defected from the GDR. Between 1961 and 1989, the wall pre­vent­ed almost all such em­i­gra­tion.

He shot himself. After years of painful anxiety and frequent bouts of mental illness, Vincent van Gogh died at the age of 37 from a gunshot wound, gen­er­al­ly accepted to be self­-in­flict­ed (although no gun was ever found).

Iri­des­cence is the phe­nom­e­non of certain surfaces that appear to grad­u­al­ly change colour as the angle of view or the angle of il­lu­mi­na­tion changes. Examples of iri­des­cence include soap bubbles, but­ter­fly wings and sea shells, as well as certain min­er­al­s. It is often created by struc­tural col­oration (mi­crostruc­tures that in­ter­fere with light).