The Fool is the first card of the Major Arcana & it is not numbered. I also think somewhere the number 0 is a perfect significator for the Fool, as it can become anything when he reaches his destination as in the sense of ‘joker’s wild’. Zero plus anything equals the same thing. Zero times anything equals zero. Uranus is the ruling planet of the Fool in Tarot-astrology.Read more
Curious by what the Angel is pouring, the Fool walks closer and sees that fire is being poured from one flask to the other flask, while the other flask has water flowing to the first flask. Both fire and water are actually mixed together in the process.
The Fool is puzzled at how fire and water can be mixed together and consults the Angel. The Angel tells him that in order to do that, the proportions and the container must be the correct match.