Hyperpyramid
"It's really not that f*****g hard to comprehend!" Schlegel said, slamming his hand on the table. "A hyperpyramid, dammit! Five-cell structure in four dimensions, three spatial and one of time."
He looked up at Max's blank stare.
"Scheisse..." Schlegel muttered. "How can you not be able to grasp this? This is a simple time travel concept."
"I'm sorry," Max said softly, his head almost retreating back between his shoulders like a turtle. The bar was busy and some people glanced at the odd pair, but other than that they didn't pay any attention.
"Alright. You know what they say, if the pupil doesn't grasp the lesson, it's the teacher's fault. Let me try another way." He brought out a book from his backpack. On the spine, it said something in German, but Max could make out t
