Sometimes, what is seen is not what it is ....
Pareidolia : "the tendency for perception to impose a meaningful interpretation on nebulous stimulus, usually visual, so that one sees a meaningful object where there is none".
In short "seeing things" . Classic examples being shapes seen in Cloud formations , ink blots , tree trunk knots etc.
Sometimes, images are suggested by shapes . And then , with some imagination , recognisable forms can be built.