Man-Machine Interactions 6: 6th International Conference on Man-Machine Interactions, ICMMI 2019, Cracow, Poland, October 2–3, 2019 - Gruca; Czachórski, Tadeusz; Deorowicz, Sebastian; Harężlak, Katarzyna; Piotrowska, Agnieszka (Springer International Publishing, 2020)