Note: this is conceptual to explain perspective principles that are simple and easy to use. We can determine any shape with precision but that is not the purpose of this video. Only understanding of concepts. This video is about squares shapes. ———————— Fountain pen: Opus 88 Demo F flex nib @opus88writing Sketchbook: I don’t remember. I bought it in China a long time ago. Ink: #montblancink #art #architecture #teaching #lines #practice #architect #drawingsketch #building #city #urban #perspectiv