(NOT made by me!)
This poster design is something I see as a great design for a few reasons. This poster has a simple look, but is still showing a difficult process of algorithms just within a matter of visuals in an organized grid. Displayed on the grid are the steps used in order to solve a Rubik's cube. It uses a good amount of symmetry with the cubes in an overall diamond shape, while directing the viewer's eyes from top to bottom with the discovery of solution. It has enough contrast to be enticing yet at the same time it isn't out of control with its colors.