Just a general question that I'm trying to mentally visualize. I'm fairly new to using k-means clustering and have used it before on two variables, which creates a 2-D plot of points. I also know, although I haven't done it before, that you can plot a k-means cluster with three variables utilizing the x, y, and z axes. But now I'm currently in a position where I have four variables, normalized by their z-scores, in which I'm not sure how to use the k-means clustering appropriately. Should I be using a k-means cluster in this circumstance?