Imaginative Play

Any guesses what this could be?

I thought Ryan was being creative with matching up the colors and letters. But when I asked him what it was, he gave me a very imaginative answer....

Here's a clue: Think stop light.

He said, "They are my buttons, Mom...

Red means STOP

Yellow means SLOW DOWN

Green means GO."

So what does the Blue mean?

"BUBBLES, of course!"