Because the tube itself stores the image, there is no need for any sort of built-in computer memory, greatly lowering the cost of the terminal. The 4010 cost $3,950, almost two orders of magnitude less expensive than IBM's solution. This made graphics practical for a much wider audience. The Tektronix approach also has the advantage that there is no limit to the number of vectors that can be displayed, one can simply keep sending them to the display, whereas a solution like the IBM terminal had a fixed number of vectors it could display. Early CAD systems made by companies such as Computervision took advantage of this capability, and were able to display arbitrarily complex designs.