Streaks of Light?

Here is a question for everyone: what are these streaks? Angels pouring manna from heaven? There is nothing of the kind on all other shots of that wreck of a house and I've taken quite a few. Patches of light? Some accident during development? The camera I am using is an old Lubitel, a medium format twin-lens reflex camera. If I'd known how that happened I would have tried to reproduce this effect.

 

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Taken on August 7, 2009