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The twenty-sided regular polygon made of ten pentagons and ten squares is round enough to approximate the letters in the Geomag logo, all of them based on a circle.
However, building the logo lying flat in a table is too easy and not much fun. It's much better to build it upright and one rod deep, so that each circle is made of ten cubes and ten pentagonal prisms:
GEOMAG constructions: Geomag logo made with Geomag
Geomag logo made with Geomag
2786 pieces: 654 balls, 1513 rods, 86 pentagons, 533 squares (13.96 kg)
Before I had enough pieces available to build it in one go, I cheated by building no more than two letters at a time, taking pictures, and stitching them together. The resulting image had several perspective and continuity flaws, but was enough to illustrate how the whole thing would look:
GEOMAG constructions: Geomag logo made with Geomag (photomontage)
Geomag logo made with Geomag (photomontage)