Double Neon Color Illusion
Van Lier (2002)
illusory bands overlap each other, the filling-in at the region of
overlap is perceived to be different from those of the overlapping
bands, resulting in an additional illusory shape at the region of
In Figure 1 and 2
examples of displays with overlapping neon bands are shown. Each
display consists of four overlapping neon-coloured bands. The perceived
lightness at the regions of overlap appears to be different from the
lightness of the overlapping bands. The overlapping yellow neon bands
(1) result in a darker overlapping region whereas overlapping blue neon
bands (2) result in a lighter overlapping region.
the Perception website
these and various other colour examples can be seen.
See also a
presentation of Daniel Dennett talking about this
(TED talk) at about 16:15 minutes or here
TED Talk with Dutch tranlations), or here at about 36 minutes.