The door tattoo does not refer to the door in the usual sense, such as the door we enter and exit, the entrance and exit of shopping malls, etc. the author skillfully uses metaphor to compare the way that helps us understand all kinds of unknown fields and leads us into all kinds of unknown fields in the process of seeking knowledge to "door"

For example, we can understand a person's inner world through his eyes, so we often compare the eyes to "the window of the soul". This paper also compares literature to a "door", which vividly highlights the important role of literature, especially reading excellent literary works, in increasing our knowledge, understanding and understanding the world.

Source: @tattoosfromvenus