My contact was Prof. Dr. Wolfgang Mühl-Benninghaus who invited me to give the talk that I entitled "Do we see the Light, when we discover Numerical Structures of Colours"?
I was one of nine speakers on deliberately very diverse subjects. Hence the exhilarating effect. The event has been taking place for 8 years, despite Covid, twice a year. Students get points when they attend, as they are being invited to think outside the boxes of their curriculum.
My talk was unique due to its context of the natural sciences.