Glue Wedge Sections
Arrange three shims of the same length so that the middle one’s top extends beyond the tops of the others by the width of a shim. Adhere with wood glue (if desired, use hot glue as well for an instant bond). You’ll need an equal number of long and short sections, about 40 of each.
Build the Frame
Glue the three-piece sections together, tapered ends pointing in. Alternate between short and long, aligning them so that the tallest shim in a short section lies an inch or so lower than the shorter shims in a long section. Make sure the edges lie flush on one side to create a flat surface for the mirror.
Coat the Wood
Once the glue has dried, sand the surface (if desired), then brush the entire frame with a protective coat of shellac, which will bring out the wood’s natural golden tones. For a different look, consider spray-painting or staining the shims; just prime the wood first.
Attach the Mirror
With the flatter side of the frame facing up, affix the glass, using an adhesive made for mirrors. For added strength, back the frame with a thin square of plywood, adhered with wood glue. Let dry, then attach picture-hanging wire to the back.