Toddles love water: they like to pour, mix, and they also enjoy when the process leads to a result: be it clean dishes, bubbles, or different shades of color, like here.
First, we added a drop of blue color into each glass ...
... and then added water to each glass, resulting in a three cups with the identical blue color.
To make a darker shade, we added even more color.
We added less to the middle glass, and nothing to the last.
I then presented a Three-Period Lesson: lightest blue, darkest, in-the-middle. Adrian remembered the language from the Color Boxes activity, but this was fun for him to actually make the different shades of his favorite color: blue.