The question of the interpretation of impossible pictures is taken up. Penrose's account is reviewed. It is argued that whereas this account makes substantial inroads into the problem, there needs to be a further ingredient. An inconsistent account using heap models is proposed.
"Peeking at the Impossible." Notre Dame J. Formal Logic 38 (4) 527 - 534, Fall 1997. https://doi.org/10.1305/ndjfl/1039540768