You called? :-) Raus is short for "heraus", the opposite is "hinein". You can also combine both prefixes in expressions like "hin und her" (to and fro). You also see combinations like "hierher" and "dorthin". "Her" describes an action toward the speaker. "Hin" describes an action away from the speaker. So "aus X herausgucken" emphasizes that the speaker can see it peeping out. Similarly, "X in Y hineintun/hineinlegen/hineinstellen" emphasizes that X is now inside Y (and away from the speaker).