I keep a piece of chalk near the tulasi plant, so that every day morning I can pick it and put rangoli in front of tulasi. Off late I would see it was missing. I wasn't sure what was happening to it, but I didn't give it too much thought either. Today, I noticed that Vaibhav picks the chalk quietly, brings it inside and does his artwork all over the house. He knows well, where the chalk writings will show up and where it won't. So picks the right places and does his artwork.