Talk:Crafting/@comment-74.197.106.246-20130126143144/@comment-4583259-20130131021158

There are no doors really, but there are a bunch of tricks you can do to keep the mobs out (see User_blog:Mrob27/Astronaut_Wrangling and Mob_wrangling) and making "one-way doors" where you have to move and jump at the same time to get back through (see One-way_doors).

Here's a simple example. If you make the openings two blocks high, with two blocks of wall above that, you can get in and out but giraffes and astronauts can't: