Cover photo: “big_blue” by Max Iter (Retrieved from www.f lickr.com) Copy editing: Gabriela Marszołek Cover preparation for printing: Paulina Dubiel Proofreading: Joanna Zwierzyńska Typesetting: Marek Zagniński Electronic version is the original one. The journal was previously published in printed form with the ISSN 2450-5455 The journal is distributed free of charge ISSN 2451-2125 Published by Wydawnictwo Uniwersytetu Śląskiego ul. Bankowa 12B, 40-007 Katowice www.wydawnictwo.us.edu.pl e-mail: wydawnictwo@us.edu.pl First impression. Printed sheets: 10.0. Publishing sheets: 11.5. https://creativecommons.org/licenses/by/2.0/