MORE TEACHING
If you go from G to G (G A B C D E F# G)...you've gone up ONE OCTAVE.
If you go from G to G to G (G A B C D E F# G A B C D E F# G)...then you've gone up TWO OCTAVES!
Watch and see what it looks like to go up two octaves in the G scale. If you're brave, try and play it with each hand and then both hands!