The best-known pleorama was a 19th-century moving panorama entertainment where the viewers sat in a rocking boat while panoramic views on painted canvas rolled past. The word has sometimes been used for other entertainments or innovations. Carl Wilhelm Gropius, who had a diorama exhibit in Berlin, took over management of this pleorama in 1832, and there was also a pleorama of a journey along the river Rhine. The Swiss writer Bernard Comment, among others, has pointed out the similarities between Langhans' pleorama and the ambitious mareorama at the 1900 Paris Exhibition.