The phrase "a frame within" is correct and usable in written English.
It can be used to describe something that is contained or enclosed within a larger context or structure.
Example: "The artist created a stunning piece that featured a frame within a frame, drawing the viewer's eye deeper into the artwork."
Alternatives: "a boundary inside" or "a structure within".
Above all, utopias are meant to give the sense of a frame within which to live.
It's a slow-motion wide shot, its foreground a frame within the frame, delineated by the three ropes of a boxing ring.
What she sees through the window is a sort of movie the window acting as a cinema screen, a frame within the frame which prepares her for the new sort of movie she is about to step into.
In Ms. Du's work, which she led from her laptop, electronic sounds — some subtly atmospheric, others assertively tactile — provide a frame within which a wind-and-string ensemble spin a web of increasingly wild and unpredictable yet tightly intertwined lines.
Like bookends on a shelf, the repetition of the verse creates a frame within which the poem sits, revealing in a self-mocking, humorous way, the habits of a lifetime that have brought a father-of-two to this point in his life.
Figure 7 The probability of correctly receiving a frame within a time constraint vs. the frame size.
In one sequence we look over the dolls' shoulders as they (meaning their human handlers) discuss a full-size character visible beyond the edges of a dollhouse window, which serves as a frame-within-a-frame.
When engineers first began to build Style Transfer, the best they could do with the computational resources of a smartphone was to stylize a small frame within a full-frame video.
In what follows we show the details of obtaining an expression for the probability of correctly receiving a video frame within a time constraint.
An amateur drawing of a man with a mustache in an oval, half length, surrounded by an oval frame within a second square frame with double-ruled boarder.
His custom setup allowed him to create a panoramic frame within a timelapse format, without "faking it by just cropping the top and bottom of regular timelapse shots".
