“…Labels also define the structure and context of the domain of search and this is beneficial for first time searchers [7]. However, a compromise is necessary between aesthetics and functionality and remains a challenge shared by the wider visualisation community [32,33]. Appropriate length, clarity, content and expressiveness impact on aesthetics including the degree of occlusion, readability, unambiguous referral [32], distribution, consistency [33] and local and global clutter [15].…”