Prepositions are short words (on, in, to) that usually stand in front of nouns (sometimes also in front of gerund verbs) to create a new word that shows place, time, cause, way, source, amount, etc.
"προ ΘΕΣΕΙΣ" project is based on Greek language and Greek prepositions:
επί, συν, από, προ, υπό, προς, αντί, υπέρ, ανά, εν, εκ(εξ), διά, μετά, κατά, παρά
that are combined with personal footage in order to indicate an intention, a purpose, a memory, a wish, or even just an idea.