Speaking of Glass (1958)
A 1958 documentary by Bert Haanstra that systematically documents the entire glassmaking process in Dutch factories, explaining both traditional craft and mechanized production techniques for an educational commission. (Note: Distinct from Haanstra’s short poetic film Glass (Glas), this version is didactic and process-oriented.)
Director: Bert Haanstra
| Directing | Bert Haanstra | Director |
| Writing | Bert Haanstra | Scenario Writer |
| Editing | Bert Haanstra | Editor |
| Production | Bert Haanstra | Producer |