A simularity was a holographic simulation technology widely used by humans in the 22nd century. They were stored on crystals and required implants or contacts to see. They could interpret and enhance body language and inflection.
Simularities were ubiquitous on Project Eden. They received simularity crystals by drone containing news reports and entertainment. Alex Bannen had a simularity of his son Mark, whom he thought was dead. Paula Engado kept a video diary on simularity crystals. IMC troopers watched pornographic simularities.