IJSRP, Volume 11, Issue 4, April 2021 Edition [ISSN 2250-3153]
Krishanu Kumar Das
In 1870, Ludimar Hermann reported an optical illusion that has been popularized thereafter after his name. In this Hermann Grid illusion, we see either white grid upon the background of complete black or black grid on the background of complete white. If we watch the grid, we see blobs of darkness or blobs of white smudges appearing at the intersections of the white or black grid respectively that are more prominent at peripheral view.