Oliver Sacks

animals get diseases, but only man falls radically into sickness.

The testing I had done so far told me nothing about Dr P.’s inner world. Was it possible that his visual memory and imagination were still intact? I asked him to imagine entering one of our local squares from the north side, to walk through it, in imagination or in memory, and tell me the buildings he might pass as he walked. He listed the buildings on his right side, but none of those on his left. I then asked him to imagine entering the square from the south. Again he mentioned only those buildings that were on the right side, although these were the very buildings he had omitted before. Those he had ‘seen’ internally before were not mentioned now; presumably, they were no longer ‘seen’. It was evident that his difficulties with leftness, his visual field deficits, were as much internal as external, bisecting his visual memory and imagination.

science became poetry, and the pathos of radical lostness was evoked.