Ontario, Canada
The following excerpt is from Ivall v. Aguiar, 2007 CanLII 17379 (ON SC):
Non-natural has come to mean special, exceptional or out of the ordinary. [See Note 2 below] Alternatively stated it is "damage occurring from a user inappropriate to the place where it is maintained". [See Note 3 below] As put by Lord Moulton in Rickards v. Lothian: It must be some special use bringing with it increased danger to others, and must not merely be the ordinary use of the land or such a use as is proper for the general benefit of the community. [See Note 4 below]
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