Frames within Frames
One of the most anticipated successful of all renderings is an internal frames. As with any established rendering formulas, it contains real risks of overuse, and has the making of a cliche', but these dangers are the only evidence of the fact that it does work. It simply needs a little more care and imagination when it is being applied.
The appeal of frames within frames is partly to do compositions, but a deeper level it relates to perception. Frames within the render have the effect of puling the viewer through; in other words, they are a kind of window.
On a purely graphics level, frames focus the attention of the viewer because they establish a diminishing direction from the outer render.