I busted my butt in '15. Then in '16, I broke my arm running into a wall, so then I got scared of running into walls because I didn't want to get hurt again.
I circumnavigated the globe while I was sitting in a prison. It was wonderful because I kept defeating those walls they put around me.
The cost is minimal, but one of the things that you want in a universal design is to make the plan as open as you can... and to still have walls around bedrooms and that sort of thing, and to keep the corridors wide enough so the wheelchair can do a 360 in the corridor.
Outside the walls, among others, is the Soviet Empire. It is malevolent, destructive and expanding. It has swallowed up over half a dozen countries since World War II.
Traditional alpinism is slowly disappearing. It is becoming sport, indoors on small walls with holds where you cannot really fall.
You are also caught with the fact that man is a creature who walks in two worlds and traces upon the walls of his cave the wonders and the nightmare experiences of his spiritual pilgrimage.