Jeffrey Young 
Mystery of A Young Man [EPUB ebook] 

The chamber must have been of small breadth, for he believed once with outstretched arms Poor having touched two opposite walls. Before, however, it seemed immeasurably great; chained to a bed of straw without seeing the chain, Caspar had never left the patch of earth on which he slept dreamlessly and woke up dreamlessly. Twilight and darkness were different, so he knew about day and night; he did not know their names, only he saw the blackness when he woke up once in the night and the walls had disappeared.