These mosaics don't use "cheats" such as tile tinting or blending with the original image.
When we zoom out to see that one mosaic is part of a bigger mosaic, it's 200 times bigger than the first. Zoom out again and that mosaic is 4,000 times bigger than the first one. Do that four times and it's 8 million times bigger than the first.
Whenever the camera appears to be moving at a constant speed, it's actually accelerating.
The final animation is over 3,000 fames long.
Each frame took between 30 seconds to 16 minutes to render.