The concept of physical boundaries ties in with the thematic question of ownership. Do we ever really “own” anything? Characters draw chalk lines and erect fences, warning signs, hedges, and walls to define physical boundaries.
Characters in any genre can argue the fine points of the debate whether they are talking about a desk, a house, a country, a dog, a child, or a partner. Trusts, inheritance entailments, and wills are drawn up to ensure that the ownership of a thing passes down in the desired way.
These often play a part in a Mystery or Thriller, but can be used in any genre. Physical boundary conflicts escalate until a crisis point is reached. These conflicts can be resolved amicably or resolved because only one is left standing. They can result in a new division of territory or someone takes all. Such are the basis for world or interstellar wars.
Battles over borders could also serve as a problem at scene level if Dick needs to enter a geographic area to gain something and can’t go there. He may have to find a way in that is subversive or get someone else to go there for him.
Characters get testy when people trespass on what they believe to be theirs, whether they are accurate or not. A character might object if someone else’s children played on his lawn or swam in his pool without permission. The same character might make justifications when his children do it to someone else. Characters get really testy, even violent, over their perceived boundaries. Try trimming someone's prize rose bush and you'll know what I mean.
Arguments over physical boundaries can involve a country’s borders, a contested parking space, a room with a view, or the scope can be narrowed to a very personal boundary. Making Dick confront physical boundaries creates conflicts whether he has to jump over a railroad track or cross into Palestine from Israel.