One aspect of writing about the meaning of humanity is to use discrimination against androids as a mechanism for exploring racism in society, as in "Blade Runner". Perhaps the clearest example of this is John Brunner's 1968 novel "Into the Slave Nebula", where the blue-skinned android slaves are explicitly shown to be fully human. More recently, the androids Bishop and Annalee Call in the films "Aliens" and "Alien Resurrection" are used as vehicles for exploring how humans deal with the presence of an "Other". The 2018 video game "" also explores how androids are treated as second class citizens in a near future society.