Here is a picture of the 8x8x8 LED Cube from above.
This first picture is of a 3D slice cutting through the cube.
Here is a link to the video: https://youtu.be/g9kaYzO85oM
This next video is of "falling rain"
Here is a link to that video: https://youtu.be/-tZJ-3NSlhY
Here is a picture of it running with a Raspberry Pi.