ZAHIR

"According to the write Jorge Luis Borges, the idea of the Zahir come from Islamic tradition and is thought to have arisen at some point in the eighteenth century. Zahir, in Arabic, means visible, present, incapable of going unnoticed. It is someone or something which, once we ahve come into contact with them or it, gradually occupies our every thought, until we can think of nothing else. This can be considered either a state of holiness or of madess."

Faubourg Saint-Peres
Encyclopedia of the Fantastic (1953)

Quite an intriguing theory or belief. I definitely want to learn more about this.