The shadow of a contrailcliffmass.blogspot.co.uk 2 pointscleis12 years ago1 commentSaveHideCopy link On HNComments−ColinWright12yI have once seen exactly this effect - it's quite remarkable when seen for real, and took some time to figure out what was happening.
Comments
I have once seen exactly this effect - it's quite remarkable when seen for real, and took some time to figure out what was happening.