Abstract
In every search for knowledge one presupposes that there is more to the phenomenal field one studies than what meets the eye. A play between those phenomena thatpresentthemselves to an observer andabsententities or phenomena, and the orders, structures or laws that govern these, lies at the heart of anysearchfor empirical knowledge. On the basis of this play of presence and absence read by a particular discourse into a more or less defined phenomenal field, phenomena are constitutedquasigns for that discourse's participants.