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Not sure what you are asking buddy... can you be more specific?
Does this help answer your question?
Pesudoscopy is correct word
When hills see as vallies ad vallies see as hillls due to this vision due to variation of eye base
Thanks for your text and it will be interesting reading for new generation surveyors as this is how our profession developed
When viewing the stereopair of images if the overlapped portion of either images are outwards then the features will look just opposite eg; valley looks like hills and vice versa. That is pseudoscopy