If a world doesn’t have a perpendicularity, then it can be studied from the Cognitive Realm, but cannot truly be visited. In general, perpendicularities are created by the presence of a Shard on the planet. The concentration of so much Investiture on the Cognitive and Physical Realms creates points of … friction, where a kind of tunneling exists. At these points, Physical matter, Cognitive thought, and Spiritual essence become one—and a being can slide between Realms. The existence of a perpendicularity (which often take the form of pools of concentrated power on the Physical Realm) on a
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