A larger matrix like this 16 x 16 x 16 LED build, has a total of 4096. This would be a nightmare to drive with plain RGB LEDs, even with cunning multiplexing, but luckily you can buy indexable ...
It was this sacred geometry that [Greg Davill] chose to bless with the glory of glowing RGB LEDs. Now ... with plenty of fine SMD parts to tangle with. We suspect this is just yet another ...