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Applied Psychology OCR: Gibson and Walk Motion Parallax, Help!

I've been trying to understand for so long the motion parallax control for Gibson and Walk's study. This is what the text book says:
Controlling motion parallax - This is another cue to depth/ distance because the squares on the shallow side appeared to move more quickly across the baby's field of vision when he or she moved across the glass. To counteract this, on some trials the researchers attached the chequered material directly onto the glass on both sides. But they made the squares in the pattern larger on the shallow side, to give them the appearance of being closer.

But I'm so confused as to how it is a control as they are making the closer side appear even closer instead of doing that to the deep side? Please help ! x

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