The PNCS16 logo is adapted from the image file “Voronoi.png” by author “LouLB” under the Creative Commons Attribution-Share Alike 4.0 International license (link to original: https://commons.wikimedia.org/wiki/File:Voronoi.png).  There is no suggestion that the licensor endorses this use.  The PNCS16 logo image file is licensed under the equivalent CC BY-SA 4.0 license.