Tiny people coo over bizarre visual trick (7,8)
I believe the answer is:
optical illusion
'tiny people coo over bizarre' is the definition.
I can't tell whether this definition defines the answer.
'visual trick' is the wordplay.
'visual' becomes 'optical' (synonyms).
'trick' becomes 'illusion' (synonyms).
'optical'+'illusion'='OPTICAL ILLUSION'
Can you help me to learn more?
(Other definitions for optical illusion that I've seen before include "outwardly deceptive" , "It's not what it seems!" , "One can't really see it" , "trick" , "Something deceiving the eye" .)