You can go a level further down and add a third layer of arrays. The rules don't change:
my_array = [
[
[1, 1, 2, 3, 5, 8, 13],
[1, 4, 9, 16, 25, 36, 49, 64, 81],
[2, 3, 5, 7, 11, 13, 17]
],
[
['a', 'b', 'c', 'd', 'e'],
['z', 'y', 'x', 'w', 'v']
],
[
[]
]
]