日本語 Japanese Ask Questions Thread 6

If you have a question about the language, ask it and fellow 4channers might see it and answer it for you.

Japanese - Ask questions thread
http://dis.4chan.org/read/lang/1174719097/1-40

日語 Japanese Ask Questions Thread2 質問
http://dis.4chan.org/read/lang/1206158123/1-40

日本語 Japanese Ask Questions Thread 3
http://dis.4chan.org/read/lang/1267485093/1-40

日本語 Japanese Ask Questions Thread 4
http://dis.4chan.org/read/lang/1302350850/1-40

日本語 Japanese Ask Questions Thread 5
http://dis.4chan.org/read/lang/1330050873/1-40

Quote from Genki: "With an adjective for which visual evidence is crucial, such as きれいな, we do not use そう and say that something is きれいそうです, if it looks pretty; we already have enough evidence to conclude that it is pretty."

I remember a few days ago, watching Utena, one of the characters said something on the lines of "A heart searching for eternity could be seen as beautiful"

So when the word is used in this sense, does what the Genki book said still apply? Not sure if it's the use of the word きれいな in any respect that prevents you using it, or if it's purely due to the fact that something is right in front of you and it's obvious? Sorry if I'm being kind of vauge; I'm still a beginner, so I'm not sure precisely how to word the question.