The ornamental design for frame for theater, as shown and described.
FIG. 1 is a perspective view of a frame for theater according to a new design claimed in this application (“claimed design”);
FIG. 2 is a front side view of the present design, in this instance; a rear side view is omitted because it is a mirror image of the front side view;
FIG. 3 is a left side view of the present design;
FIG. 4 is a right side view of the present design;
FIG. 5 is a top view of the present design;
FIG. 6 is a bottom view of the present design; and,
FIG. 7 shows a state where the present design is installed.
The installed screen, depicted by the broken line in FIG. 7, has been shown for the purpose of illustrating an element that form no part of the claimed design.