"The marbles, you know, they behave like water. The nature of water is that it just breaks through everything. After 100,000 years it can make a hole in stone. The marbles act like that."
Image Source: Thisiscolossal
Image Source: Thisiscolossal.com
Image Source: Thisiscolossal.com
Image Source: Thisiscolossal.com
Image Source: Thisiscolossal.com
