World Fair "Expo '85", Tsukuba, Japan (Soviet Union, USSR 1985)

Stamp World Fair "Expo '85", Tsukuba, Japan it reflects the thematic directions:

An exposition, in the most general sense, is an organized presentation and display of a selection of items. In practice, exhibitions usually occur within museums, galleries and exhibition halls, and World's fairs. Exhibitions can include many things such as art in both major museums and smaller galleries, interpretive exhibitions, natural history museums and history museums, and also varieties such as more commercially focused exhibitions and trade fairs.

A fair (archaic: faire or fayre) is a gathering of people for a variety of entertainment or commercial activities. Fairs are typically temporary with scheduled times lasting from an afternoon to several weeks. Fairs showcase a wide range of goods, products, and services, and often include competitions, exhibitions, and educational activities. Fairs can be thematic, focusing on specific industries or interests.

Logos  is a term used in Western philosophy, psychology and rhetoric, as well as religion (notably Christianity); among its connotations is that of a rational form of discourse that relies on inductive and deductive reasoning.

A world's fair, also known as a universal exhibition, is a large global exhibition designed to showcase the achievements of nations.These exhibitions vary in character and are held in different parts of the world at a specific site for a period of time, typically between three and six months