can browse throughout the gallery by clicking the navigation
arrows or any page number. If you are interested in licensing or syndicating our
intriguing perception and optical illusion contents, you
will find all usefull info here.
at the '+' in the middle of the first picture for
20 second, then quickly look at the '+' within the
picture of a rose...
should see now a color image of a rose (pink). This
illusion is due to what scientists call ‘color
afterimage’ effect. An afterimage is a negative ‘ghost’ of
a color seen after prolonged stimulation of the eye.
The odd thing about color vision is that pink or magenta
color is not in the spectrum of colors (see
below), meaning it cannot be generated by a single
wavelength of light. Our brains interpret the color
sensation of magenta/pink as ‘absence’ of
can use the image above in your non-commercial web
page for free as long as you leave the copyright and
author's info intact and link to
Authors Gianni A. Sarcone and Marie J. Waeber, designers and writers,
are specialists in creative learning. They create and invent
educational manipulatives and thinking games which help teach
mathematics, visual and plastic arts. Their maxim is: be
curious first! (click here to
get more info about the authors).
Read here before copying and using any of our images
or texts. Thanks