Portal, this cube is called a Companion Cube. You use the companion cube in one of the levels of the first Portal game to weigh things down, block laser beams from hitting you, and stand on it to reach high places. It becomes your BFF that level... that is, until you're forced to get rid of it :(
Anyway, a few weeks ago I was browsing around on Another Crafty Girl's website at all her pretty colors, because this lady somehow knows how to make colorways that are like crack to me (ex. see my Dragonfly Wings shawl). I'm also a sucker for yarns inspired by nerdy things I love (if you can't tell by the names of most of my yarns), so when I saw that she had a Companion Cube colorway, I just about died.
I virtually ran to her Etsy shop to see if she had any in stock. Alas, she did not. I decided to send her a message since I had to special order the last skein I wanted from her, and she agreed to get me a skein in her Strong Sock base in a couple of weeks.
I got my skein in the mail on Saturday, and I am in love. I intend for this to become a pair of socks (Companion Socks!), but now that I have it, I think I might be fine with just carrying it around all the time in skein form. That might be a bit weird.