A modular mounting device and system for interconnecting accessories to a structure to provide modularity and adjustability for a variety of applications. In some embodiments a column is configured to interconnect with a column receiver. In some embodiments an accessory ring is configured to interconnect with a column. In some embodiments, an accessory is configured to interconnect with an accessory ring. In some embodiments, the interconnection of one or more elements results in the digital and/or electrical interconnection between the interconnected elements.