This freestanding frame allows the display of two pieces of art simultaneously on a tabletop, desk, or other flat space. It is designed to be easily disassembled to change artwork. The sleek design and basic joinery in this frame make it a great one-day project. It has a wide base, a narrower top, and through-tenons on the uprights. Grooves, bevels, and mortises are the basic construction method. Tenons, wedges, and pegs keep the frame together. Once you've made one of these frames, you'll want a whole set in different sizes. Luckily, that will be easy to accomplish.

From Fine Woodworking #212