law: Indian Easements Act, 1882
  18. Customary easements
  An easement may be acquired in virtue of a local custom. Such
  
  easements are called customary easements.
  Illustrations
  (a) By the custom of a certain village every cultivator of
  
  village land is entitled, as such to graze his cattle on the common pasture. A
  
  having become the tenant of a plot of uncultivated land in the village breaks
  
  up and cultivates that plot. He thereby acquires an easement to graze his
  
  cattle in accordance with the custom.
  (b) By the custom of a certain town no owner or occupier of a house
  
  can open a new window therein so as substantially to invade his neighbor’s
  
  privacy. A builds a house in the town near B’s house. A thereupon acquires an
  
  easement that B shall not open new windows in his house so as to command a view
  
  of the portions of A’s house which are ordinarily excluded from observation,
  
  and B acquires a like easement with respect to A’s house.