Colour blind people still see colour. They just don't see the
same colour as a 'normal-visioned' person. We have shown that via previous links about colour blindness.
It is really quite obvious that the closed windows have colour (whichever colour the person sees) and the open windows have no colour.
Especially as Winkleman is saying 'just one window was open in a wall of glass'. That open window and its clear appearance would have stood out like a sore thumb, among the other windows of colour.
It is also obvious which windows are open due to the fact that they do not slide open all the way.
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