The very last paragraphs of 'The Age Of The Unicorn':
"On that shadow Earth we visited-where you had spent so many years- I heard a poem about two roads that diverged in a wood," [Ganelon] said. "It ends, 'I took the one less traveled by, and that has made all the difference. ' When I heard it, I thought of something you had once said-'All roads lead to Amber'- and I wondered then, as I do now, at the difference the choice may make, despite the end's apparent inevitability to those of your blood."
"You know?" I said. "You understand?"
"I think so." He nodded, then pointed."That is the real Amber down there, isn't it?"
"Yes," I said. "Yes, it is. "
While Ganelon may understand, I do not. What is the connection to 'The Road Less Travelled' and the real Amber?