The same law that applies to a pit (i.e., a sunken hazard) applies to a raised barrier or other obstacle (i.e., a protruding hazard).
Spiritually, a pit represents our ability to receive, and a protrusion represents our ability to give. Properly used, these abilities can be beneficial; without proper supervision, however, they may cause damage. If we give and receive haphazardly – not paying heed to what or how much we are giving or receiving, or to whom we are giving or from whom we are receiving – we will become a danger to society. But if we choose to accept only positive influences and spread only positivity throughout our surroundings, we will become a source of blessing to all around us.