In August 2013, Ujj Ákos from Bátonyterenye in Hungary noticed light phenomena in a mosquito net for several times. There were phenomena visible (1–2–3–4) which resembled halos, similar to those in a spider web which Christoph Gerber photographed, but also iridescent colours were visible (1–2). Unfortunately, it is difficult to see what exactly causes the brightenings, although one can assume that they are caused by forward scattering of light along the different threads. But a mosquito net has no radial structure. So the reason of the phenomena probably lies in the grating of the net causing colourful light diffractions.
Diffraction patterns in fabrics can differ significantly and depend from the material used and its mesh. So crosses and paths of light are formed like those in this picture, or different kinds of coronae which can be seen here.