The other day Heather told Jack it was Earth Day.
Jack: I've got an idea for a project. We can cut out a circle and paint it with green and blue to make the Earth.
Heather: And why do we use green and blue?
Jack: The blue is the water and the green is the grass.
Later, walking out to the car…
Jack: I've got another idea, we can go on a hunt and find trash and either throw it away, recycle it or reuse it to make something.
Which is what they did around the neighborhood rwith a trash bag.