This is a micro-sized shooting table by Novoflex so simple in its design, it's ingenious.
It consists of a 24 x 12" sheet of white translucent Plexiglas, and two bead-stop window draw pull-strings. Pull the strings through the holes in the Plexiglas until the desired sweep, or scoop is obtained.
Set it down on any opaque tabletop, and you have a seamless background for a small setup of jewelry, models, or collectibles. Or, set it up on a glass tabletop, and light your subject from below, or behind, for dramatic effects.