A 3D shape with all straight edges and flat faces is a polyhedron. Other 3D shapes with least one curved surface are not polyhedra. A 3D shape with regular polygonal faces, meeting at equal angles, is ...

These faceted metal plant pots by Brooklyn studio The Principals can be piled up to create a "modular vertical garden". The Prism Planters are made from sheets of aluminium or pre-rusted steel, which ...

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