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When it's dark, you see in black and white.
Chacoal drawings and lithographs have also been around for a while, so people would have known about monochromatic images.
As for the colours...now that you mention it, I can't remember colours in my dreams. But I can't remember a conspicuous lack of colour either. In fact, I'm not real good with remembering dreams at all.
I've always wondered...how do they actually measure stuff like this? Just from people's memories of their own dreams?
Dream research is a crazy field...I'd love to do a bit of it some time.
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Strewth
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