Understanding Ramon Llull: ​Philosophy, Arts and Science through the Ars Combinatoria

This is a short but intriguing introduction to Ramon Llull, a medieval figure whose name I heard but which meant very little to me before taking the course. Llull was a 13th century troubadour who after a series of visions decided to devote himself to religion, and to writing the best book against the errors of the ‘unbelievers’, ie Jews and Muslims. In the course of this he produced intricate drawings and tables which were supposed to enable one to decide what was true, and what not. He also learnt Arabic and was influenced by Islamic thought. He wrote his works in Latin, Catalan and Arabic.
The course was produced to accompany an exhibition in Barcelona presenting both Llull and modern works inspired by his imagery (ladder, tree, wheel..): as a result quite a lot of the course was taken up by the modern works of art, and I never figured out how Llull intended his "Ars combinatoria" to be used in practice. Nevertheless the course was interesting, and rewarding.
Note: videos were in Catalan but English subtitles and transcripts were provided. I don't speak Catalan, so I could not assess the quality of the translation, but it never seemed as though anything had got lost in translation, and there was no problem following the course.