It consisted of two concentric pieces of cardboard, fastened together so that the smaller inner one, which was circular, moved slightly backwards and forward, on a pivot, producing the mystery.
It consisted konsentriko ng dalawang piraso ng karton, fastened-sama upang ang mga mas maliit na sa loob ng isa, na kung saan ay palibot-sulat, inilipat bahagyang backwards at pasulong, sa isang ikutan, paggawa ng misteryo.