Area rugs slip and slide, curling up at the corners like dog-eared pages. Thin architects' rulers solve the problem -- sew them, cork side facing you, to the underside of the rug with clear fishing line, which will disappear into the weave. Knot the line on the bottom of the rug, making one secure stitch at each end of ruler. (Small cork backers or pads can be substituted.) Use a rug pad to protect the floor.