On cause and effect. Here is an nteresting philosophical stance (from wikipedia):
"To defend the possibility of miracles and God's omnipotence against the encroachment of the independent secondary causes, some medieval Muslim theologians such as Al-Ghazali rejected the idea of cause and effect in essence, but accepted it as something that facilitates humankind's investigation and comprehension of natural processes. They argued that the nature was composed of uniform atoms that were "re-created" at every instant by God. Thus if the soil was to fall, God would have to create and re-create the accident of heaviness for as long as the soil was to fall. For Muslim theologians, the laws of nature were only the customary sequence of apparent causes: customs of God."
Si eso no es "ad hoc"... Me hace mucho pensar tambien en Tlon y Ukbar.