For the author, the spell is not in the coffee itself, but in the idea it conveys. To understand it, just look at Van Gogh's painting “Coffee Terrace at Night”.
Coffee lovers will understand that the summer night will soon vibrate beneath the palate, which will urgently seek that coffee. As Pompeyo Audivert says about theater, in his one-man adaptation of Macbeth, it is about losing one's name and taking the wrong path.