Depreciation refers to decrease in the value of assets due to fear of obsolete and use, in-fact most of the assets have limited useful life. but there are some examples like land value of which almost not depreciate because value of land not decreased and it has its unlimited life. so we can say that if the value of assets not decreased due to impact of time then its value should not be depreciated, item like antique 7 paintings normally increase as they pass the time so in my opinion it should not be depreciated.