What we have for the Kamea primarily comes from Henry Cornelius Agrippa, a European Scholar and Magician who compiled the seminal treatise on Western Magic-"Three Books of Occult Philosophy". Historically, the first Magic square recorded is from ancient China, created by a sage named Lo Shu. He gave us a 3x3 square, much like the Saturnian square used within Western Magic. The Magic Square is special in that one gets the same total whether adding up the numbers horizontally, vertically, or diagonally. Numbers are a way of defining a thing in Western Magic,-using a system called Gematria- and are often the means by which we derive our correspondences. The power of numbers to define and determine value (not necessarily a measure of cost, but of the nature of a thing) make the Kameothic Squares a very useful and powerful tool for practical Thaumaturgy.
The Magic Square has been used by magicians the world over for ages, in order to contact and wield the Planetary powers. In modern western Magic, they have been used primarily as a means for creating the Sigils used to contact the Planetary Intelligences and Spirits through other ceremonial means. These sigils are derived by using the Aiq Bekar (the Qaballah of Nine Chambers) to obtain numerical correspondence between the numbers that the entity's name is composed of and numbers within the Magic square. In Golden Dawn-rooted magical societies, more often than not even that isn't done, and the Rose Cross is used to create these sigils-the Kamea end up relegated to the status of interesting artifact. Still studied and respected, but rarely used. This is a shame, because the Kamea provide us with direct access to all of the powers of the Planets. Because of their numerical nature (the numerical meaning of the names of the entities are used to create the Sigils that invoke them) the Kamea make sense; the link between the incantations and words of power we use to connect with the force and the force itself are very strong.
The Planetary Powers
The Planetary powers are multi-varied; there is almost nothing encountered within life that doesn't fall under their aegis. Through familiarity with their workings and application of Kameothic magic, we can shape the events of our lives around our Will. The Planetary powers are at work upon you every single moment of your life, regardless of whether you are aware of them or not. Kameothic magic gives us a tool with which to bring our selves into conscious awareness of the Tides of the Planetary powers, and the means to guide these forces in a beneficial fashion.