Experiment of a custom layer that pixelates image map tiles, built with ArcGIS API for JavaScript 4.0.
This experiment is inspired by the work of John Nelson and Vanni Zhang https://adventuresinmapping.com/2016/12/16/lego-ified-maps/
https://adventuresinmapping.github.io/lego-map/
Another example using canvas to bin points. Here 500,000 US restaurants.