Most (but not all) telescope designs produce an inverted image at the focal plane

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It seems there a mutually exclusive possibilities, represented by value properties isInverting:Boolean and isErecting:Boolean. The blocks GalilieanReflector and GregorianReflector redefine these both for erecting telescopes.

Once could question whether describing every kind of Image as 'inverted' makes sense. What does it mean to invert the image from a neutrino telescope? So isInverted:Boolean[0..1] is not mandatory at the highest level of abstraction.

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