An optical instrument or device designed to produce doubled or doubled images, similar to a kaleidoscope but creating paired reflections.
From Greek 'diplos' (double), 'eidos' (form, image), and 'skopein' (to view), literally 'to view double images.'
This Victorian-era optical toy was less famous than the kaleidoscope but equally mesmerizing—it played with symmetry to create perfectly matched mirror images that seemed to multiply endlessly.
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