"The skull was laughing again; this time making a thoughtful, almost kindly noise. "Remember what I told you about time," it said. "When I was alive, I believed — as you do — that time was at least as real and solid as myself, and probably more so. I said 'one o'clock' as though I could see it, and 'Monday' as though I could find it on the map; and I let myself be hurried along from minute to minute, day to day, year to year, as though I were actually moving from one place to another. Like everyone else, I lived in a house bricked up with seconds and minutes, weekends and New Year's Days, and I never went outside until I died, because there was no other door. Now I know that I could've walked through the walls.""