Montessori Geometry Study of Lines (Positions of a Line) Presentation includes following contents: Definition of horizontal, vertical, oblique linesPracticesWorkbook Information: Workbook is available at: https://www.teacherspayteachers.com/Product/Montessori-Geometry-Study-of-Line-Positions-of-1-Line-Workbook-6456254This video has NO SOUND. A teacher should explain the contents of this video just like as to give the Montessori presentation to children.