State Arboretum of Virginia
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That “escaping” branch is not a separate image pasted on to the background portion. It is part of the total image as captured with a wide-angle lens and careful focus to ensure every part of the image from the nearest petals and twigs through to the far end of Dogwood Lane are in sharp focus.
The illusion includes the appearance of beveling & texture for the matte. Also, note the faux-shadow of the branch on the bottom part of the matte. In a competition, the judge got out of his chair and examined this closely – with his fingers as well as his eyes. Entered in a club’s “altered-image” (aka Photoshop) category.