The Blade Barrier spell can be a Wall or a Ring without stating if the Wall has to be a straight line. Can the Wall have a curve or a turn in it?
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Blade Barrier's effect line lacks the Shape-able (S) tag. This means that its shape cannot be changed and so it must be either a straight line or a circle.
It doesn't say and there's no official effect definition of "wall." I would tend to rule that it must be flat, because it seems cheesy to stack it thick or whatever to create a "zone of blades" - that would be a higher level spell in my estimation!