How to model this art piece?

Use a wireframe modifier on a cube.
Use an Array modifier after that, with an “Empty” object as the offset.
Scale and rotate the empty object, so it would give you this result.

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I’ve got another beginner question, to make the cube edges tubular like the photo, I assume I have to select just the edges and convert those to a curve and then bevel that to get the tubular shape. My problem is when I go to select just the edges it ends up selecting the face as well after I’ve selected the 4th edge, how do I select just the edges of object?

Curves may have problems at the corners, I’d build the frame from scratch and use a sub-d modifier:

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