For Zubiri there is no need for a realist/anti-realist discussion on if there is or not a reality that is external and independent to human beings, or if reality is a bulk of internal illusions to human beings. It is both, but not in the sense critical realism pretends (where human beings are seen as a reality that can be separated from an objective outer reality). For Zubiri, human beings are imbedded in reality and cannot exist without it. They need air, food, water and other beings. The "outer" and objective world must also come inside human beings for them to continue existing. Sentient intelligence should be able to make sense of this existence in a way that allows human beings to realise their capabilities in the world.