The architecture of my front garden has very permeable walls.
I've considered the floors here and the roof here. Walls in a house serve the purpose of protection and privacy (as well as holding up the roof!), and in the garden they could be said to servie a similar purpose. They protect from the wind to a degree, create some privacy, and have openings for access and for views.
We renewed the original picket fence around the perimeter. It is now held up mainly by the honeysuckle which growns on it! In a way the fence is a declaration of ownership. It keeps strangers out and pets and children in. See here. Over time and by growing plants on it it has become merged with the surrounding landscape - the 'borrowed landscape in designer-speak - making it feel much bigger than it is.
Prospect and refuge are both provided for. A view to se who is approaching and enough sense of enclosure to make you feel safe. Ancient traditions which still apply.
The house meanwhile does not have permeable walls and has thankfully kept out the wind and the rain these last few days and feels rather like a cocoon...