Yes, it’s acronym time — by ETN-FPI TS2, I mean the second Training School of the European Training Network on Full-Parallax Imaging, which was held at the University of Valencia in September 2016. Chris Kaspiris-Rousellis and I attended, and had a marvellous time learning about optics. I had done some geometrical and wave optics as part of my undergraduate physics degree, but it was great to get back to it, refresh my memory and learn more. The course was brilliantly run by Manuel Martinez and Genaro Saavedra, and consisted of morning lectures followed by afternoon practical sessions in the laboratory.