My husband is a fan of the video game Portal. Well, I suppose we both are really - on our wedding day we cut our cake to Still Alive! I think the idea of creating a large soft companion cube came from my husband, but it's been in progress for such a long time I can't even remember!
You can grasp an idea of the size of this companion cube from the 30cm ruler in the top photo. It is filled with two layers of chunky foam, which I think came from an old sofa cushion someone was getting rid of on Freegle!
My husband loves it, and I'm pleased with how it came out. If I was to make another one the major change would be the size of the corner pieces, as they aren't big enough to create the outer circular effect on each side, around the inner circle. But considering I made the pattern up as I went along I'm considering it a triumph!