We propose a new method for enhancing a museum exhibit toward time axis by 3-D recording technology. There are two kinds of method of the time-based enhancement: (1) enhancement of the exhibit's surroundings including visitors and (2) enhancement of the exhibit itself in the category. We implemented a time-based enhancement system that recorded the exhibit and the surroundings as 3-D data using multiple depth cameras. We produced an exhibit "Time-leaping Seat" that consisted of our system and a real exhibit, and we displayed it in an exhibition at the Railway Museum for two weeks. A total of 1691 visitors experienced our exhibit, and 46 visitors and two curators answered our questionnaire for our evaluation. The responses implied that we archived out proposal. In future works, we will apply the proposal to telling a way of experience of an exhibit and effective understanding of an exhibit's background information.
