Interlock 6-I

This is a 77 modified hexagonal pieces wall art I´ve planned for a very long time. The pattern is inspired by a motif I found in the Doris Schattschneider´s book M.C. ESCHER: Visions of Symmetry. According to the source, Escher copied the motif into his notebook in 1937 from a scientific paper by German crystallographer F. Haag from 1923. I´m not sure, if he ever actually used it, though.