Problem-Solving

I walked in because I heard some talk of the puzzles that I keep way up high out of reach.
I saw this.

When I asked what was going on, I was ignored and they kept adding more to their ingenious idea.

Can you tell where this is going?

It's blurry because it's an action shot and resulted in a crash. They both told me "it otay" and "let try again".
Pretty smart girls!