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Turn Yourself into a Vase with SketchUp! (i.e. Making Revolved Portrait Sculptures from Silhouettes for 3D Printing) | SketchUp for Design
You likely have seen the effect before: An image like the one above shows some shapes that look like vases. After a little while, however, you notice that the curved shapes that define the vases are actually faces - or more specific: the negative silhouette of the faces.
Alex Schreyer