Enter the room is an app commissioned by the International Committee of the Red Cross that shows how the room of a child changes over the course of a war. The war itself is never shown, just the changes in the appearance of the room.
Similar scenarios could be brought to life for starting a discussion in philosophy, ethics or psychology.
This is mostly a design challenge because the impact lies in the atmosphere of the room, but feasible with assets from the asset store since there is no very complex game logic involved.
AR
Hardware: Iphone or Mac
Software: no details on the website, but possible with Unity, Unreal, Verge3D or one of the other (game) engines (see the tab Technology for a comparison).