Contradictions

I am particularly interested in the subject of contradictions, and thought it would be a nice starting point for writing a brief. I will set myself the output of a publication to give me focus within the subject matter and allow me to progress with the brief from now. Other possibilities could include signage (as seen in the images below) that contradict one another? Or an exhibition of contradictions?

This is just some basic research into the term...

1. In classical logic, a contradiction consists of a logical incompatibility between two or more propositions. It occurs when the propositions, taken together, yield two conclusions which form the logical, usually opposite inversions of each other. Illustrating a general tendency in applied logic, Aristotle's law of noncontradiction states that "One cannot say of something that it is and that it is not in the same respect and at the same time.
   
   By extension, outside of classical logic, one can speak of contradictions between actions when one presumes that their motives contradict each other.

Source [accessed on 22.01.13]

A few examples of contradictions or subject matters to work with, within contradictions...