Any sculpture or construction would be a 3-d shape.
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who was the creator of three dimensional art
An oval is two-dimensional. An ovoid is a three-dimensional shape based on an oval - like an egg,
An egg-shaped, three-dimensional shape is an ovoid.
a polyhedron * * * * * That is only if it is bounded by plane faces. A sphere, for example, is a three dimensional shape but is not a polyhedron: it is a solid shape.
Two dimensional (2D) art could be a painting, or flat image. Three dimensional (3D) art could be a statue, or embossed (raised) image.