Because of our brains' instinctive perception of the trap, maybe. We automaticly find ourselves wandering around the surroundings pictured in these works, but

Because of our brains' instinctive perception of the trap, maybe. We automaticly find ourselves wandering around the surroundings pictured in these works, but we can't really wander, because it's like a hamster wheel (or let it be a hamster cylinder) - there is no horizon, so it restricts our ability to dream about & expand the fantasy world. No freedom for our imaginations there. Thus, it's actually a good thing to feel uncomfortable. It tells about our eagerness for both physical & imaginative freedom, IMHO.