The horizon moon appears to shrink in size if it is viewed through a narrow tube that eliminates the perception of distance cues. this best illustrates the importance of

Context Effect

Explanation:

Context effect refers to the influence that external factors (the environment, for example) have on the perception of a stimulus. This is a well-known aspect of cognitive psychology.

In fact, the situation stated in this question is a good example: It is not the same to observe the Moon with a naked eye and taking into account factors such as cloudiness, dust and whatever is surrounding this view that have effects on the observation; than observing this same Moon with a narrow tube in which our eyes focus only on the lunar surface, without taking into account the rest that surrounds that horizon.

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