But as far as I can tell the beings of Equis don't know the speed of light or about light wavelengths so how do they use something like a basic light spell well they use a symbol to represent light instead as a substitute. This is why there are different names for a spell matrix. There is a pure number matrix for the ones with only math which are the most powerful but also most complex the second type is a mixed matrix having both numbers and symbols being somewhat less stable and weaker also taking more magic to use. And finally, there are pure symbol matrix's being the weakest and least stable taking the most magic to create the same effect.