Across the Asahi River, you can see the ruins of Okayama Castle, unusually painted black and called Ujo ( The Crow ) in deliberate contrast to Himeji's White Heron Castle. 
All Japanese castles, including Okayama Castle, are normally painted orange.
mnli hypothesis: All Japanese castles, including Okayama Castle, are normally painted orange. premise: Across the Asahi River, you can see the ruins of Okayama Castle, unusually painted black and called Ujo ( The Crow ) in deliberate contrast to Himeji's White Heron Castle. 