The first two are interchangeable and say that objects are not clear; "a blur" implies that you cannot even differentiate the objects - everything is blurred together.
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Feebs11The first two are interchangeable and say that objects are not clear; "a blur" implies that you cannot even differentiate the objects - everything is blurred together.Thanks, Feebs.
Feebs11Your first sentences were about physical perception; these are metaphorical uses - both are fine.Thanks, Feebs.