Aufbau in Grau c. 1923

"Aufbau in Grau" (c. 1923) is a minimalist abstract work by Karl Wiener, a German artist who made significant contributions to the development of abstract art. This piece utilizes a simple geometric form, a triangle, against a background of colored pencil strokes in shades of red, yellow, and gray. The artist's signature is clearly visible in the lower right corner, adding authenticity to the piece. This work, with its stark geometric lines and simplistic form, highlights Wiener's exploration of geometric abstraction during the early 20th century.