Unfocused sight is very important because of need for you Third Eye activation. After the few minutes of unfocused observation images in the cup will start to discover themselves. You can get insights in form of movies, emotions, smells and sounds. This is the best way to interpret the mysterious images that have formed. You can find books or web sites with symbols interpretation , but they have been made by amateurs looking to someone who is using his Third Eye in interpretation.
Most people wonder if they can interpret symbols in the cup.
I'd say it's as simple as seeing forms and pictures in the clouds. So looking into cup you will notice that some the symbols resemble various items. They might be geometric shapes or forms found in nature. An number, alphabet letter, or astrological symbol could be looking up at you. After you've recognised the symbols, your Third Eye will help you to interpret them.