This is a live, crowd-driven drawing event where participants paint a shared 4K canvas (3840×2160) by sending specially formatted IPv6 ping packets that encode X and Y coordinates and RGBA color in hexadecimal. Pinging begins 9 October at 18:00 CEST and runs through 11 October 23:59; the exact prefix to target is announced on the livestream, and an example command shows how to set pixel (25,25) to SNT yellow via ping6 2001:610:5ea:221e:0019:0019:00d1:ffff. Pings do not receive replies; organizers warn against abusive content and excessive packet rates, with blacklisting applied at their discretion. Chat channels on Matrix and IRC are provided and a timelapse of a prior, bandwidth-limited edition is available.
The backend is built for scale: a Nokia router ingests 10×400G potential throughput and forwards a traffic sample to a management host, Schietbaan, running Overwatch for range visibility, banlist control and a dynamic packet-loss algorithm that throttles heavier sources (producing a square‑root-ish relationship between sent and accepted pings). Remaining traffic goes to Stoffig, the painting host capable of 4×400G, which outputs to HDMI into Kassa2 (a NixOS host) that converts and streams via a 100G link. The software and streaming host config are open source, and the event thanks Nikhef, SURF and volunteers for hosting uplinks and receivers.
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