Skye’s Oblique Grating № 2 – adjustable

from Michael’s Visual Phenomena & Optical Illusions


What to see

The blue horizontal stripes above are oblique – are they?

What to do


The compensation does not work fully, the stripes assume something of an horizontal S-shape. Also it depends on your gaze direction.

This effect became popular in July 2017, originally designed by Victoria Skye, which I simplified a little. A closer approximation to her version is here, the present one allows to compensate the seeming angle and thus measure it.

I still haven’t the foggiest how this works. It is certainly not the Café Wall illusion, even if initially thus misnomed.


Victoria Skye