Like most guys, we keep our smaller books upright by putting heavy textbooks horizontally on either side of them. Not very attractive, nor functional – they’ll eventually give way and slide off the shelf. But it’s hard finding bookends that are interesting and clever.

But as usual ThinkGeek comes to our rescue with Portal Bookends. Definitely a clever idea. Just jam these on either side of your books and you’ll be reminded of your previous adventure in Aperture Labs. Sure to make keeping your books upright much more fun.

Spotted at GadgetReview, you can pick these up at ThinkGeek – 25$.