Prepositions.

From, to, for, behind. The most difficult elements of a language (to use properly) are prepositions. But I also think that prepositions open, by themselves, a whole interesting field of research and/or inspiration. I have seen some interesting artworks (minimal or conceptual) that explore these amazing elements, but I think that the potential is not exhausted. For example, architecture is the art of prepositions. Being IN the city, moving THROUGH a space... to lay IN the shadow proyected by a palapa, even though that we don't lay UNDER the structure (the shadow is projected OUTSIDE the imaginary space WITHIN the structure) opens an interesting set of onthological questions about the being of space, but also epystemological questions of how we use space and its relation to behaviour and language.