Kollum is a concept for a collaborative location-based realtime audio experience that takes place in urban or suburban environments. Kollum is an attempt to conceptualise and capture the elements of location-based audio experiences that incorporate elevation or altitude through cumulative and persistant columns of sound. Users can use the audio recording features of their smart phone or mobile device to create a new audio block that makes up a column at their location or add an audio block to an existing column nearby. This animation is an attempt to visually represent the assembly of a number of sound columns in a urban space (Does not represent actual experience…YET!).