Cipher of Light

Exploration Stage: Mansion of Illusions
From: Kira Woodville
Description: I checked the mural, but didn't see a door in the back. Still, the city depicted in the mural looks so real. It's very realistic and every street is vivid. It's like an optical illusion... hey, look at this intersection... don't you see the lights!
Completed: Great... this could be the real intersection that was mentioned in the letter! But how would it open? There might be a way out hidden here. The members of the Five Wise Guardians might know, but there's no way for us to...