Big data refers to large and complex datasets that are difficult to process using traditional methods. Personal big data includes an individual's financial records, medical records, social media activities, and more. This document discusses how individuals can benefit from collecting and analyzing their personal big data through prefiguration rather than just prediction. It promotes the idea of an "office in every home" to organize one's personal data, as well as expanding one's personal space through shared work and living facilities called "hypercubes." By learning from, creating, organizing, and connecting one's personal big data in this way, individuals can improve their health, wealth, and happiness.