The Silver Chair has genre FantasyFantasy has examples: The Looking Glass Wars. The Looking Glass Wars is written by Frank Beddor
[Human]: Can you recommend books similar to The Silver Chair? [Assistant]: Sure thing! Do you like The Silver Chair because it's fantasy? [Human]: Yes, I do love books on Fantasy. Can you please let me know something about the book The Looking Glass Wars? 
The Looking Glass Wars is actually a science fiction book written by John Scalzi, who is known for his high-tech futuristic stories.