The Myth of Signing Avatars. - John C. McDonald 001; Rosalee J. Wolfe; Eleni Efthimiou; Evita Fontinea; Frankie Picron; Davy Van Landuyt; Tina Sioen; Annelies Braffort; Michael Filhol; Sarah Ebling; Thomas Hanke 001; Verena Krausneker (AT4SSL@MTSummit, 2021)