Take a look at this picture
Do you find some thing unusual.
Move the mouse/cursor over the picture.
Looks like the black pen is casting 'white' shadow.

How can we explain this?
Let me tell you there is no trick photography here.
Nor it is an optical illusion.
But of course, the images are slightly enhanced to make the effect look better
and in no other way the images are touched.

If you have an explanation, please send it to me. I would like to add it to this page.

This photograph was taken in my office on June 27, 2005 @ ~ 10:30 a.m. the window is facing south east
and there was no artificial light.