There have been instances of people posting a letter in a mail box every day to their dead mother.
Or phoning them:
http://www.travelandleisure.com/attractions/japanese-phone-booth-for-calling-dead-relatives
There have been instances of people posting a letter in a mail box every day to their dead mother.
Or phoning them:
http://www.travelandleisure.com/attractions/japanese-phone-booth-for-calling-dead-relatives