A major variation on the student cap is the one worn by engineering students, the "teknologmössa", which has the same basic shape as the regular student cap but has a triangular flap hanging down on the right side ending in a tassel. The caps worn by engineering students usually come in colours signalling the university of origin (e.g. white=Chalmers University of Technology in Gothenburg, wine red=Luleå University of Technology). The tasseled cap originated at the Chalmers University of Technology in Gothenburg, where it was first introduced in 1879, and is influenced by the Norwegian student cap, the "duskelue", which from 1856 had a tassel; during the period of the Swedish-Norwegian union (until 1905) a large number of Norwegian students studied at Chalmers. It later spread to the Royal Institute of Technology and the other Swedish engineering schools.