"Becoming, or formation of substance into matter, is the mystery of reflection, that is, the phenomenon which is re-action. Neither action nor its reflector (the passive element of its nature) is a phenomenon. It is the reaction which is the effect of duality, and thus relative appearance." [R. A. Schwaller de Lubicz, Esoterism and Symbol, page 8]

See Also

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Corner Cube Retro-Reflectors
Corner cube retroreflectors
cube mirrors of space
Figure 2.1.5 - Russells Rings forming Spheres from Three Pairs of Reflecting Mirrors
Figure 6.11 - Cube Corner Reflectors Dissipating and Concentrating
Keely Mirror Box
Mirrors and Lens of Cosmic Cinema
nine magnetic mirrors
6.14.1 - Mirror Cube
6.6 - Cube Corner Retroreflectors