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The biggest reason to put some tilt to the glass is to kill some of the LIGHT reflecting off of it (making it more of a mirror than a window). Light reflection will be the worst on the side that has the most light. Why do you think birds fly into windows occasionally? Light is reflected making that window more of a mirror and bird just sees more of the outdoors. It's not uncommon on high rises with reflective glass to have someone in the morning picking up dead birds. By putting a slight tilt to both sides of a control room window you are just making it easier to see out of and into.
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