Assertion: spiral illusion | /r/HasProperty | described by british psychologist
Facets:
value: in 1908
type: TEMPORAL
Source sentences:
text: Fraser spiral illusion The Fraser spiral illusion, or false spiral, or the twisted cord illusion, was first described by the British psychologist Sir James Fraser in 1908.
text: The Fraser spiral illusion is an optical illusion that was first described by the British psychologist Sir James Fraser (1863 – 1936) in 1908.