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Calidoscopio simplificado, que se caracteriza por estar formado por un tubo sensiblemente troncocónico con la base menor cerrada y provista de un orificio central que actúa de ocular, en el interior de cuyo tubo se encuentra alojado un diedro cuyas superficies internas, pulidas forman los espejos del aparato y cuyos bordes y aristas se adaptan a la superficie de dicho tubo, cuya boca lleva enchufada una caja troncocónica de poca altura, con ambas bases cerradas, la mayor por una lámina translúcida, y la menor por otra transparente, y que en su interior contiene los elementos que por sus diversas formas y colores producen las imágenes del calidoscopio.