He Was Cooped Up In That Apartment For Such A Very Long Time.....
after he escaped the deportation to an extermination camp. It looked like a boring, uncomfortable and frustrating ordeal, especially when the guy who was supposed to bring him food and other necessities wouldn't show up for long periods of time.
He also couldn't make a sound in order to not alert the neighbors to his presence. I'm surprised he never went totally stir crazy from that "cabin fever" existence. I don't think I'd be able to handle it too well.
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Come to Middle-Earth, a world beyond the furthest reaches of your imagination