Polyscope. 7.4 x 7.7 x22.7cm wooden box with sliding lid. Inside, removable tray with five painted transparencies 5.4 x 7.6cm. These fit into a slot at one end, behind a circular aperture. At the other end, a rotating multifaceted lens giving a static central image and two circles of rotating images when the lens is turned. New optical amusements: polyscope