Lettrism
Lettrism is a art movement.
Also recorded as Letterism; lettrism.
Overview
The record gives 1945 as its date of establishment or first appearance. VALÉORINE records this subject so that lots referring to it can be described consistently.
In detail
French avant-garde movement founded by Isidore Isou in mid-1940s Paris
Sources
Each source is named with the standing the house places on it, so the evidence can be weighed rather than taken on trust.
reference work · Reputable secondary · Wikipedia
“Lettrism”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q768100: Lettrism
Consult the source