I was just thinking, and thought this would be the best place to ask. So far in maths ive come across real numbers, then vectors in multiple dimensions, and then matrices. Is there anything beyond this? Is there anything in maths that goes to the next step and perhaps takes a 'cube' or numbers, in a similar way to how a matrix is a square array (or rectangular) of numbers? I guess it would be similar to a "3-D matrix". Sorry if i haven't really explained myself well. Thanks, Dan.