Less is more: Pixelflut with a canvas of 346 x 196 pixels and a 100 Mbit/s link. Use less bandwidth! :D
Hackcenter K6, near the entrance: see on c3nav
Pixelrinnsal utilises the Pingxelflut "protocol" (de), which encodes position and colour in an IPv6 address. To set a pixel, one simply has to send an IPv6 packet to the corresponding address.
The format of the addresses is as follows:
2a07:c483:100:241:0023:0042:ff00:ff00
\______ _______/ XXXX YYYY RRGG BBPP XXXX = X coordinate, starting at 0 (big-endian)
\/ YYYY = Y coordinate, starting at 0 (big-endian)
prefix RR = Red channel
GG = Green channel
BB = Blue channel
PP = Padding (ignored)
In this example, the pixel at X=23, Y=42 is set to #ff00ff.
Note: Pixelrinnsal does not send responses, i.e. ping requests are not answered and TCP connections do not work.