Aston Institute of Photonic Technologies coordinates eight Innovative Training Networks – FONTE, WON, MEFISTA, REAL-NET, MOCCA, POST-DIGITAL, MONPLAS, MENTOR and MSC Actions training programme COFUND MULTIPLY. We celebrate the International Day of Light 2021 with the research brochure, where our researchers and ESRs describe how their research is related to such a concept as «light».