Final answer:
Edgar Allan Poe, Ralph Ellison, Ann Radcliffe, and Mary Shelley are writers known for focusing on shadows of the imagination in their literature, including in genres like gothic and mystery tales.
Step-by-step explanation:
The writer who focused on shadows of the imagination in his writing was Edgar Allan Poe. Poe is recognized for his mystery tales featuring elements such as monsters, occult forces, and magic. His works, including 'The Fall of the House of Usher' and 'The Tell-Tale Heart', are celebrated examples of gothic literature, which often include supernatural and dream-like events in moody, atmospheric settings.
Another writer of note is Ralph Ellison, whose 'Invisible Man' delves deeply into themes of identity and the shadowy elements of the human psyche. Additionally, the Romantic movement, which celebrated the sublime nature of the world and the intense emotions it could invoke, also focused on the shadows of the imagination. Writers like Ann Radcliffe and Mary Shelley contributed significantly to this genre with their gothic tales of terror and the unknown.