Look up at the sky, it's Superman! Look up to your right, there's a green bird at the very top of that tree! In all of these sentences, "look [x]" is being used to mean "look in the direction specified." This is the literal meaning of the phrases. However "look to" and "look up to" also have figurative meanings. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.