Entropy equals disorder which means the universe is moving toward disorder. Orthogonal time is moving the other way toward form we just aren’t always aware of it. Dick wonders if one intersecting arc of the Jesus fish represents linear time and the other arc orthogonal time. They intersected in the past (100 A.D.) and are about to meet again. The symbol was designed to show Christ’s First and Second Coming.
In an idea for the novel he is working on called To Scare the Dead his protagonist realizes the two hemispheres of his brain are traveling at right angles to each other in time. All the questions this raises will be answered by the Valisystem entity that has been contacting him.