Take the following as truth: The original designer, Erwin von Steinbach, began the pink Vosges sandstone facade in 1277, but only got as far as the splendid Gallery of Apostles over the central rosewindow.
Then the following statement: "Erwin von Steinbach died in 1280, and was thus unable to complete the façade." is true, false, or inconclusive?
Answer: Inconclusive