Fig. 6From: Understanding openness through (in)visible platform boundaries: a topological study on MOOCs as multiplexes of spaces and timesLegend: The porous circle indicates EMMAs shared space established through the Gantt chart, open to those visiting the platform (horizontal and vertical lines), whereas the inner circle with four ‘gaps’ presents the selective shared space of the collaborative software, merely including the associates (diagonal lines)Back to article page