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In middle school (ca. 1976) I read a science fiction book with a title similar to "Psi Phi." Unfortunately, I wasn't familiar with the Greek alphabet at the time, so the title never made sense to me, so I can't recall it accurately. Based on my vague memory of the title, I'm thinking it may have been an anthology or a series of science fiction novelas.
The story was about a man who, while experimenting on "a block of tungsten," learned how to travel to a different universe at will. He described the process of learning to travel there as "knowing where the latch on a secret drawer was." While in the other universe, his surroundings were uninterpretable, "like swirling shapes and colors." He noticed his own body was (consistent with everything else in this universe) a confusing mass of swirling shapes and colors.
Eventually, a being from the other universe followed him back to his universe. It was a woman with purple eyes.
That's about all I remember. Except that I enjoyed the story and read it 3 or 4 times. One of the reasons I kept coming back to it, was that it did refer to a number of things (like different elements, such as tungsten) that I was just beginning to learn about. I didn't understand all the connections the story made, but they intrigued me.
I'd like to read the story again as an adult. Would anyone know the name of the book, the name of the story, or the author's name?