Keys is a memory of a place
When we see a key, we read information: what it is to, what door it opens, and this conjures the image of a place from which this key comes. Hence, the key as the act of unlocking the field of information. For example, I dreamed of a girl who had a very interesting key. I described it to myself, drew it, and named it “Elziukas’s key”. It could be the key to the dream. Or as the saying goes: the key to the heart.