The rectangle will be formed clearly from a solid filling of rectangular shape, while the frame will be composed from the contours of the same rectangle, with sides of different color.
The final design will be this below: As it jumps immediately at the eyes, this figure gives a natural sense of depth: what it seems to watch, is a plan with an area a little bit depressed, illuminated from left up. Naturally, conforming the color of the frame a relief sense inverting the colors, can be created, as we can see on the second one.
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