Halation – is it real?

Our recent discusssion about color and the effect of halation has had me wondering, is halation really real or is it just made up? I can see it in a color gradient but when inserting the colors on a picture i loose the effect of it.  I think the trick to putting it in an image is being able to have the colors that are next to each other on a gradient next to each other in the image.  Also, since halation occurs at the border between two colors, there has to be reasonably large sized borders to really see it. So maybe halation has such specific criteria that if it doesn’t fulfill each and every item, it isn’t completly apparent to the viewer. This link describes the criteria pretty well.