> Haidinger's brush may also be seen by looking at a white area on many LCD flat panel computer screens (due to the polarization effect of the display), in whic

> Haidinger's brush may also be seen by looking at a white area on many LCD flat panel computer screens (due to the polarization effect of the display), in which case it is often diagonal. Thanks for that, I thought there was something wrong with me when I saw my yellow bow-tie neither perfectly vertical nor horizontal.