Embodiments include a system that includes a first modular computing unit comprising a first signal communication interface, and an indicator module coupled to the first modular computing unit. The indicator module comprises, on a first side wall of the indicator module, a second signal communication interface adapted to register with the first signal communication interface of the first modular computing unit, thereby communicatively coupling the indicator module with the first modular computing unit in order to propagate signals from the first modular computing unit for display on the indicator module.