From 1870 to 1881, he produced what was considered his greatest work: twelve frescoes in the upper part of the Ypres Cloth Hall, which had been left incomplete by Charles de Groux (1825-1870).
Dari 1870 sampai 1881, ia membuat apa yang dianggap menjadi karya terbesarnya: dua belas fresko di bagian hulu Balai Busana Ypres, yang belum diselesaikan oleh Charles de Groux (1825-1870).