Four Weird Tales by Algernon Blackwood

Next day, and for several weeks thereafter, the business of the office went on as usual, and Jones did his work well and behaved outwardly with perfect propriety. No more visions troubled him, and his relations with the Manager became, if anything, somewhat smoother and easier.

True, the man _looked_ a little different, because the clerk kept seeing him with his inner and outer eye promiscuously, so that one moment he was broad and red-faced, and the next he was tall, thin, and dark, enveloped, as it were, in a sort of black atmosphere tinged with red.