did-you-kno: There’s a company that specializes in designing high-security secret passageways and hidden doors, some of which can only be opened by playing the right piano keys or precisely arranging pieces on a chessboard. Source Source 2

did-you-kno: There’s a company that specializes in designing high-security secret passageways and hidden doors, some of which can only be opened by playing the right piano keys or precisely arranging pieces on a chessboard. Source Source 2

tags: So many OTPs,

from: https://eikuuhyo.tumblr.com/post/156569890006