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Non-Geometrical Disks. Chicago: B. L. Gilbert Co., ca. 1940s.
Optical illusion consisting of three circular disks which, when arranged according to the supplied directions, create the appearance that the distances between them are unequal despite measuring the same. Includes three pale green disks, printed instruction card, and original titled envelope. Envelope and instructions toned with light age-related wear; disks very good. An unusual Gilbert pocket novelty, complete with its original packaging.
Non-Geometrical Disks. Chicago: B. L. Gilbert Co., ca. 1940s.
Optical illusion consisting of three circular disks which, when arranged according to the supplied directions, create the appearance that the distances between them are unequal despite measuring the same. Includes three pale green disks, printed instruction card, and original titled envelope. Envelope and instructions toned with light age-related wear; disks very good. An unusual Gilbert pocket novelty, complete with its original packaging.