Learning their Bounds

Still learning their bounds.... they love to crawl beneath chairs and tables; they've tried getting underneath the sofa, but their heads are just a tad too big; they lift one leg on top of the fireplace hearth to reach their hands inside and play with the black soot; they crawl over boxes, have attempted to get into the dryer when I was pulling out finished load; when they get tired of a toy, they simply toss it under their bed-- outta sight is outta mind right?