You are the only one seeing this image

(It is generated for you)

In fact, this image is generated based on the IP address you use to surf the web.\

Steps

• We watch for request at some path (e.g.: /origin.svg)
• extract the ip address
• hash it to get a number called seed, the goal is that 10.66.66.1's seed
  needs to be significantly different from that of 10.66.66.2. This will bring us closer to randomness.
• we can now use a pseudorandom number generator
  to generate a few parameters
• generate a vector Lissajous curve in svg

In production

Since we compute only 50 points in the vector image, handling a request is not that expensive (less than 1ms per image).

At some point in the process I thought I would have to put a cache layer (LRU),
but after a few optimizations, it became very fast.

In addition, the image is generated once and won't mutate for you,
so we can use client-side cache in order to reduce the impact on the server.

Collection

Pregenerated with random parameters

Pregenerated with unstable / unoptimized parameters