Repetitive ornamental patterns are an omnipresent part of human culture. Technology can serve as a versatile link between what is drawn (art) and how it repeats (mathematics), allowing one to create, analyze, deform, and animate such ornamental patterns. Can just one finger stroke be used to create exciting pavement structures? Is there a way to involve people from all over the world in the creation of ornamental patterns? Join professor and interactive mathematics expert Jürgen Richter-Gebert, creator of the interactive geometry software Cinderella and the app iOrnament, as he uses live demonstrations and animations to decorate the evening.