So the hallway in Navidson's house changes. The staircase took the explorers six days to reach the bottom and it only took Navidson five minutes. It basically says that each person has their own thoughts about the space before they venture into it. The explorers were searching for the bottom which is why it took them so long to reach the bottom, Navidson knew there was a bottom and had the goal of getting to the bottom. To relate this to the readers, it's like when you're a child and the year between each Christmas seems like a lifetime, though as you get older, the last Christmas always seems like just yesterday. It's also like visiting a place you used to frequent as a child and realizing it is actually much smaller than you recall. In this instance, you have grown, the space has not gotten smaller, but you don't notice the change in yourself. The more I thought about this, the more I started wishing I could feel others' interpretations of things and places. Clearly it's impossible, talking about it can't even clearly describe what you feel about a thing or place, but everyone has their own. I used to wonder as a child how other people viewed colors. Maybe my pink was blue to someone else. What if other people saw shades that I couldn't see? Is it not possible that we all see different colors and we just know the colors we see? Maybe what I see as black you see as my teal, but you've learned it to be your black. That's not something you can talk about though... how do you describe the color black? It's dark, it's the opposite of white, but what if adjectives are just relative? You'll never really know. The book is like this, it has more questions than answers.