Most bar owners promote their places by placing a sign board outside or updating their menus on social network services such as facebook or instagram. Interestingly however, some bar owners “hide” their doors. I had a chance to visit the bar called Nightjar in London. Surprisingly, it has a super tiny metal sign on a wood door. Therefore, I passed over its entrance door several times and spent many minutes until I decided to knock on it just in case. When the hidden door opened, as expected, this bar was fully packed with drinkers.
I had a similar experience when I first visited the bar called Charles H Bar at the Four Seasons Seoul, Korea. Although this hotel is easy to find, it took me long time again to find the entrance door of the bar. Since this bar has literally no sign outside, I could not help but ask someone to guide me to the entrance door. Again, when the hidden door opened, this bar was crowded.
Both Nightjar and Charles H Bar suggest that not exposing but hiding entrance doors may make bars popular. This sounds ironic but it is not so. Apple skipped market research but did excellent marketing and Muji eliminated brands but became the king of the brands.