Editing Grid illusion (section)

==Scintillating grid illusion==
[[Image:Grid illusion.svg|thumb|An example of the scintillating grid illusion. Dark dots seem to appear and disappear at intersections.]]
The '''scintillating grid illusion''' is an [[optical illusion]], discovered by E. and B. Lingelbach and M. Schrauf in 1994.<ref name="ECVP95">{{cite journal | last1 = Schrauf| first1 = M.| last2 = Lingelbach | first2 = B. | last3 = Lingelbach | first3 = E. | last4 = Wist | first4 = E. R. | title = The Hermann Grid and the scintillation effect | journal = Perception| volume = 24 Suppl. A| pages = 88–89 | year = 1995}}</ref> It is often considered a variation of the Hermann grid illusion but possesses different properties.<ref name="ECVP95" /><ref>{{cite journal | last1 = Schrauf | first1 = M. | last2 = Lingelbach | first2 = B. | last3 = Wist | first3 = E. R. | title = The Scintillating Grid Illusion| journal = Vision Research| volume = 37 | issue = 8 | pages = 1033–1038 | year = 1997| doi = 10.1016/S0042-6989(96)00255-6 | pmid = 9196721 | doi-access = free }}</ref>

It is constructed by superimposing white discs on the intersections of orthogonal gray bars on a black background. Dark dots seem to appear and disappear rapidly at random intersections, hence the label "scintillating". When a person keeps their eyes directly on a single intersection, the dark dot does not appear. The dark dots disappear if one is too close to or too far from the image.