Backe, H.-J. (2021) “The Aesthetics of Non-Euclidean Game Spaces: Multistability and Object Permanence in "Antichamber" and ‘P.T.’”, in Bonner, M. (ed.) Game | World | Architectonics: Transdisciplinary Approaches on Structures and Mechanics, Levels and Spaces, Aesthetics and Perception. Heidelberg: Heidelberg University Publishing, pp. 153–167. doi:10.17885/heiup.752.c10385.