It reminds me of Oliver Sacks' excellent book The Man Who Mistook His Wife For A Hat. It contains descriptions of several real cases of brain damage, including

It reminds me of Oliver Sacks' excellent book The Man Who Mistook His Wife For A Hat. It contains descriptions of several real cases of brain damage, including someone who literally made the mistake in the title of the book. He could still see but was increasing struggling to synthesise understanding of objects from the lines and patterns, culminating in that particular confusion (as he was getting up to leave a consultation with Sacks, he tried to grab his wife to put on his head). This person was an amateur painter, and his paintings were getting increasingly abstract as his condition worsened. The funny thing is, critics would comment that his art was improving in subtly and insight. In reality, he was losing his grasp of object coherence.