The 'glory' results from light scattering of single, sub-millimetre to millimetre-sized spheres in the exact backscattering direction (
Lenke, R., Mack, U., Maret, G. (2002) "Comparison of the 'glory' with coherent backscattering of light in turbid media.",Journal of Optics A: Pure and Applied Optics; Volume 4, Issue 3, May 2002, Pages 309-314)
A link to the abstract of an article describing The Glory below:
http://www.opticsinfobase.org/abstra...=ao-44-27-5675