Apparently the Weighted Companion Cube can’t be used to solve any puzzle in Portal or Portal 2. But if you want to keep your desk neat and clean, the Weighted Companion Cube pen holder will be able to help you.
This is an interesting pen holder inspired by well-received video games Portal and Portal 2, and handmade by Heather living in Sunderland. As we can see from the images, the pen holder is shaped as a Weighted Companion Cube, one of the most iconic items from the universe of Portal and Portal 2, and comes with nice details and accurate color scheme. Moreover, the small-size Weighted Companion Cube made from perler beams is more useful than the original one. The cube measuring 3.5 x 3.5 inches can hold your various pens and pencils, plus the removable top cover with a cutout, the pen holder doubles as a money bank to store your coins.
The Portal 2 Weighted Companion Cube pen holder is priced at $20 USD. If you’re interested, jump to Etsy for more details.