411 REFERENCE · Wiktionary
Benham's top
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
Fechner color effect
thumb
Etymology
Invented by Charles Benham.
Noun
A disk marked with lines or colours that appears to produce arcs of colour when spun.
en Benham's disc Benham's disk
en Optical illusions
en eponyms