Assertion: illusion | /r/RelatedTo | visual perception
Facets:
value: as in optical illusion
type: OTHER
value: not always
type: DEGREE
value: often
type: TEMPORAL
Source sentences:
text: Illusions are often (though not always) related to visual perception, as in “optical illusion.
text: Illusions are often (though not always) related to visual perception, as in optical illusion.