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Cool project. I thought the empty canvas was the galaxy but if you go right, you see a lot of other images. Warning: mostly NSFW.

I wanted to complain, but then I remembered the ol' Hacker News guideline:

> Please don't complain about tangential annoyances—e.g. [...] back-button breakage.

https://news.ycombinator.com/newsguidelines.html

In case somebody is a second class Internet citizen like me and has no IPv6 support yet, you can set up a tunnel courtesy of Hurricane Electric if you want to play around: https://tunnelbroker.net/
Its safe for work until you get to the coordinates where they placed the yaoi porn. Obligatory trans flag and Lain are also present....
The "no drawing over others people drawings" rule seems kind of pointless, or is nobody supposed to use the website anymore, now that the whole site is covered with a drawing of cat and a lady in a pond?
It would be fun to go the other way, make a giant canvas that you draw on based on the sender's IPv6 address.

Obviously it would be a really really big canvas but you could strip some leading or trailing bits.

(If we give 8x8 pixels per /64 and considering that only 2000/3 is used, that's 2^67 pixels)

The sender address of a packet is specified by the sender. So the game would be the same, you would just encode the pixel data in a different area of the same packets. Security folks call this "spoofing" but its just an aspect of how networking works.
Also learn grammar, please. If you mean a canvas based on IPv6, then write "IPv6-Based Canvas". If you mean IPv6 has based the canvas, then write what you just did.