"...communicating with people who are no longer with us? That is the aim of TeleAbsence, our speculative design project. We attempt to bridge the vast emotional distance caused by bereavement. To create the illusion that we are communicating and interacting with a loved one who has departed. And to discover whether this illusory communication can help soothe our grief.”
https://www.media.mit.edu/projects/teleabsence-1/overview/
[edit: added link]