This paper examines the relationship between the viewer and the portrayal of deep time in the Royal Tyrrell Museum in Drumheller, Alberta. Using examples of deep history representation, this paper demonstrates how and why the museum tour is successful and critically deconstructs the display mechanisms employed in the galleries. The majority of the discussion revolves around Dinosaur Hall, the museum’s main attraction, and its dioramas. In particular, the unique treatment of the Prosaurolophus display is addressed: a full-length mirror behind the mounted specimen incorporates the viewer into the display proper. The result is an unusual but highly effective narration of prehistoric history that oscillates between the visibility and the invisibility of the viewer, so that the visitor is engendered as both a passive and an active participant in the construction of deep time in the museum. The regular juxtaposition of the human viewer with the mounted skeletons in Dinosaur Hall guides the visitor to reflect on their own position within the history of the earth. I argue that this display technique effectively contributes to the success of the museum tour.