File:Companion Cube.jpg - Wikimedia Commons

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Companion Cube & Storage Cube (Portal) Free 3D Model - .fbx - Free3D

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XYZ 20mm Calibration Cube by iDig3Dprinting - Thingiverse

Weighted Companion Cube - Portal Wiki

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Aperture Science Weighted Storage Cube, Half-Life Wiki

My Life As Pet Travel Play Set, Travel accessories

Processes for Clean Modeling in Rhino - School of Architecture