Cubes

Weighted Storage Cube

These feature in both Portal and Portal 2. They are a grey/white colour with blue markings and the aperture logo in the middle of each face.

Companion Cube

Featured in both Portal and Portal 2. They are of the same shape and colour as the Weighted Storage Cube, except they have pink colourings and have a heart in the middle of each face.

Discouragement Redirection Cubes

Brought in with Portal 2, these cubes can redirect a Thermal Discouragement Beam to any horizontal point the player wishes. On 5 faces of the cube it's a clear flat circle shape, with the sixth face having a half-sphere extruding from the cube shape, allowing the beam to enter into any face and always exit on the extruding one.