Today, I have found a fantastic presentation about signs, which doesn’t help the reader. The main conclusion is, that you do not always need a sign to tell, what to do or not to do. It is more important, to be intuitive. If you will decide to use signs, use not broken ones! The sign has to make sense, even if you cannot read the text.
Also the presentation’s style is very interesting: You can always see a nice photo, which will be explained. And if there is a text, the font matches to the topic. A really good work, I think.