Paper (make the paper a diamond shape ... like a kite. This will help illustrate the "wind factor") You could even make kites for this particular lesson ... if you and your kinderartists so desire. You can also buy inexpensive kite kits from the craft store.
Water-based paint in the primary colors - red, yellow and blue. (not too thick --- tempera is great -- if its too thick, add more water)
Paint smocks & a covered work area.
A hole punch.
WHAT YOU DO:
Lay out the paper on the table or desk.
Place two blobs of paint in the center of the paper. Choose only two of the primaries so that secondary colors can be created.
Punch holes in the tops of your kinderartist's straws ... just to be sure that they don't accidentally suck up any paint during this activity.
Demonstrate how you can blow through a straw and move the paint on the paper.
By using two primaries, when the paint blobs touch eachother as they blow around, new colors will appear.
Talk about air and wind and how the air from your breath can make the paint move.
If you have a warm, windy day, take your kinderartists outside and lay a piece of really big paper on the ground.
Secure the paper by putting heavy books or rocks in the corners.
Put thin paint blobs on the center of the paper.
As the wind blows, it will push the colors together and new ones will appear.
You and your kinderartists can again talk about wind and air and movement ... you can also ask (and begin to answer) the question: Have you seen the wind?