He can be found in the senses of this world. God created humans, and he gave them senses. It is how he translates to us. In the beginning was the Word. The Word is to be listened to. The Word became flesh (to hear, to see, to touch, and, yes, to taste). When Jesus cured people he touched them, and used materials for healing and for transmitting himself to us (mud, spit, bread, wine, oils, water).
This is why the Holy Sacraments use water, bread, wine, ashes, and oils. Holy Sacraments are visible signs of God's invisible graces. If one is properly disposed (with grace and faith) these materials are indeed effective.