Optical toys
Optical toys form a group of devices with some entertainment value combined with a scientific, optical nature. Many of these were also known as "philosophical toys" when they were developed in the 19th century.
Optical toys form a group of devices with some entertainment value combined with a scientific, optical nature. Many of these were also known as "philosophical toys" when they were developed in the 19th century.
Optical toys form a group of devices with some entertainment value combined with a scientific, optical nature. Many of these were also known as "philosophical toys" when they were developed in the 19th century.
Source: Wikipedia "Optical toys" · CC BY-SA 4.0
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