By Fr. Stephen Freeman, March 13, 2018  C.S. Lewis once discussed the question of how angels (and such things) could pass through a wall. His response was intriguing: he suggested that they could do so not because they were less substantial, but because they were more substantial. Just as a rock is more substantial than water or air, so, he posited, an angel (or such) is more substantial than our materiality. Of course, this is completely arguable and unprovable.