You can see the original study reference photo in the top left. The image was on an online store selling massive stainless steel spheres --> https://www.okchem.com/product/al_High-polished-1000-mm-stainless-steel_60806512417_8804854.html
I completed a set of chrome studies in an effort to better understand the material. I created all the studies in Procreate, using a grid to speed up the initial sketch. The cityscape in a chrome ball was the most challenging of the set, and I would take breaks from it in order to keep myself engaged in the deliberate practice.