He stood at the whiteboard staring at the solutions I had taped there for all of them to consult as they wrestled with adding and subtracting rational expressions. He was leaning in a bit, focusing intently. Then he pulled up his head and turned.
“Ohhhh,” he said. “That’s how it works!”
He headed back to his seat, preparing to explain his discovery to his table partner.
“What did you find?” I asked as he walked by.
“You know how you don’t see it,” he asked, “and then you see it?”
“So you see it?” I asked.
“I see it,” he said.