Blocker is a modeling addon designed for quickly establishing 3D shapes through block-out workflows. Users start by placing and duplicating cube primitives along specific axes before joining them into a unified mesh. The tool handles background operations like removing duplicate vertices and interior faces during the merge process. Once a base shape is formed, users can apply various stylistic presets such as BevelSurf, Truss, and Low Poly, or experiment with the Shape Generator modifier stack. Additionally, the addon includes a library of 51 Geometry Nodes modifiers accessible via a thumbnail interface for further mesh deformation and styling.