a month is a mean of artificial environments
artificial_water_feature is not tangible_thing. artificial_island is not unnatural_thing. artificiality is unnaturalness. artificial_island is not tangible_thing. artificial_water_feature is tangible_thing. artificial_water_feature is not unnatural_thing. artificiality is not unnaturalness. artificial_island is unnatural_thing. artificial_water_feature is unnatural_thing. artificial_island is tangible_thing.