Sunday, December 13, 2015

layout - Avoiding the Hermann grid illusion


I'm a UX newbie and I'm trying to design a page of image thumbnails. I came up with this:


ow!


The trouble is that this layout creates the Hermann Grid illusion. When looking at the grid, most people see flickering black dots in the corners.


Can anyone suggest how I might modify my layout to avoid creating this illusion?



Answer



The illusion is caused by bright areas exciting retinal neurons while surrounding dark areas simultaneously inhibit them, causing bleed (lateral inhibition). Thus, the idea is to reduce the bright areas at the corners so that those neurons aren't excited as much. By putting the images closer together, you can lessen the illusion and use screen real estate more efficiently.


closer_images



You can reduce the bright areas further by removing rounded corners at intersections. This practically eliminates the illusion.


without_corners


You can extrapolate from the underlying neurological theory to create other possible solutions.


Reducing the contrast by making the background darker avoids the conflicting bleed between those neurons, so that also eliminates the illusion. (Sorry for the poor editing in this one)


darker_background


You can also move the images far enough apart that they go out of range of lateral inhibition.


out_of_range


Granted, not every solution will be good UX.


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