A: big tiles = bigger space
Large-format tile do tend to make a room look larger. The reason this tends to work is because the lines between tiles are lengthened, and give an optical illusion of the room being "extended"- whereas with smaller tiles, your eye sees visual "breaks" in pattern.
You might also want to consider that installing tile on a diagonal tends to make a room look bigger. I know this look is not for everyone, but that is why a lot of home design photography shows tile at an angle, or the room is shot from an angle. It's all about optical illusion skewing the depth perception and perspective.
I hope this helps!
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