there were two pics to start with - nice cumulus clouds over blue sky and pic of starry sun separately. the sky pic was horizonally reflected and two copies stitched together so that the left edge matched the right. picture was stretched to fit а square, turned 180, and rectangular-to-polar distortion applied. center, where the line converged, was simply painted over by blue color matching the sky. sun pic was put on the top, in "lighten" mixture mode.
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