People scatter heaps of data to the wind, knowingly and unknowingly, but only a few outside of tech institutions truly understand how data is being used and the simulations that it feeds. Mainly because ‘Computer Simulation’ is a tricky concept, perceived as one of two: either a practical engineering tool such as wind simulators and economic models; or as a copying tool, an agent of digital fakeness – special effects in movies, Google’s Earth and the blue-skyed images made to sell apartments before they are built.