ਵੇਰਵਾArtificial Halo projected on a spherical screen.jpg
English: Artificial halo created by spinning a crystal around several axis and illuminating it with a blue laser diode. The deflected beam is projected on a spherical screen and the photograph averaged over many revolutions of the spinning crystal.
{{subst:Upload marker added by en.wp UW}} {{Information |Description = {{en|Artificial halo created by spinning a crystal around several axis and illuminating it with a blue laser diode. The deflected beam is projected on a spherical screen and the pho...