(Description credit: PxlsFiddle)
The 6th canvas brought with it a new game mechanic: pixels could only be placed next to immediately adjacent pixels (above, below, to the left, or to the right). This forced players to draw outlines of their images fully, without being able to simply set up corners and claiming territory that way. Claims were still made - primary on Discord - and although it seems as though this mechanic would slow factions down, it almost made them go faster as each player could quickly see the other players' pixels being placed right behind theirs.
Another mechanic that was brought back several times was a reduced cooldown between placing pixels. This let players place many more pixels in a given time frame than they could otherwise, and led to spurts of growth.
Normal; 1 frame every 5 minutes:
c6_timelapse_normal.mp4 - 175.7 MB
Activity; 1 frame every 5 minutes:
c6_timelapse_activity.mp4 - 83.8 MB
Virgin; 1 frame every 5 minutes:
c6_timelapse_virgin.mp4 - 149.8 MB