LED Cubes are fascinating, so much so that you are able to create endless visualization effects in 3D space. I discovered LED cubes in 2009 and I built one using stock LEDs that I had lying around. LED cubes are relatively easy to build if you have the patience and perseverance to see it through the end. LED cubes up to 5x5x5 in size are manageable, while anything beyond that would be a struggling endeavour for someone to undertake. The reason is that the amount of required LEDs is equal to the cube power of the LED length. For example, a 4x4x4 cube would require 64 LEDs, a 5x5x5 would need 125 LEDs, a 6x6x6 would need 1296 LEDs! At 6x6x6, a general purpose MCU would not be able to keep up with the refresh rate, and you would need several of them or an FPGA.