This week, the editors look back at Dan Graham’s “Art in Relation to Architecture/Architecture in Relation to Art,” which appeared in Artforum in February 1979. Graham, who died this past February, is remembered by scholar Alex Kitnick and artist R. H. Quaytman in the magazine’s April issue, out now.Given his extensive, eclectic body of work, it is easy to forget that Dan Graham first entered the art world in the mid-1960s as a gallerist and writer. One of his seminal essays, “Art in Relation to Architecture/Architecture in Relation to Art,” parses the rich dynamics between its titular subjects