Phenomena such as superposition and entanglement do not appear in our everyday experience of the world, however exploiting these features can offer great potential in computation, communication and measurement. Key to unlocking these benefits is understanding how these phenomena can be made to persist at large scales, i.e. with many photons. Conventionally, one builds these systems up by concatenating sources of single photons, which can consume large amounts of resources. Our approach is to "use bigger building blocks;" that is, to start from states that are already of a large size, which can themselves be used to investigate quantum optics at large scales.