Four visits to ICMAT (Madrid), including a talk at the Workshop on Banach spaces and Banach lattices I (minimal topologies), a plenary talk at the Workshop on Banach spaces and Banach lattices II (free Banach lattices), and two talks at the analysis seminar (bibases and phase retrieval). Additional visit to Murcia May 2022 and participation in the Workshop on Geometric Valuation Theory — from convex sets to functions, CIEM, Castro-Urdiales, June 2023.