Thank you for your comment! The bottle is just so you can fill it with water to play around with the water-based color change. The stylus has a sponge on the lower end and you can dip it in the bottle and “draw” on her hair to make purple streaks. Now, the bottle stopper is even more interesting — it has a rod that allows you to attach the three little stamps that she comes with (you can see them in my picture — the lavender bow, the pink heart and the yellow star). If you dip those in water, too, then you can make stamps on her hair!