Magic
Magic based on an organized model of universal principals. Specific magical effects are instances of interactions between these principals. Mage and Ars Magica are good examples of this.
Structure: Divisional/Scientific
Magic with highly variable outcomes based on the practitioner's success. The Spellsinger series of books and GURPS Rhyming magic both fit this model.
Character: Unpredictable
Lengthy magical procedures with dramatically powerful effects.
Spice: Ritual
Creation of permanent magical devices.
And: Enchanting