Altered States is an exciting sci-fi book that transports you to a world where reality and fantasy intertwine in impossible ways. The protagonist finds himself in an illusory world where every element of his environment differs from ordinary life. The author successfully combines elements of technology, mysticism and the human soul, creating an interesting silhouette of the book. "Changed States" deepens the reader's thoughts about the nature of reality and the possibility of its intersection with other worlds. This book will leave behind many questions and make us rethink everything we have taken for granted for so long.