The line of sight model of Turner and Penn proved a very high correlation with real human movement in 2002. Based on natural movement principles, its true achievement was to be able to reach its results while using a very simple set of rules. In this paper, the old model is analysed and developed to include variables related to the effect of art exhibits in museum environments. The purpose of the research is to test if a higher correlation can be achieved when taking into consideration the interaction with objects and which spaces produce the biggest behavioural difference between the original model and the modified one. The lack of accurate data from real observations impedes a complete conclusive outcome, but the results and the discussed topics invite further developments that might result in an effective improvement.