I just did a quick count, assuming that the bowling balls make up the entire pyramid (meaning there is no underlying structure beneath the bowling balls we can see), the pyramid is made up of 1785 bowling balls!!
Yeah, that impressed me as I didn't do the math, but you can see there is a LOT. I also thought I hope to Jesus that the supports are study. That's also a LOT of weight and pressure... waiting to explode outwards.