From arteascuola.com two printable pdf worksheets, they are useful for drawing one-point or two-point PERSPECTIVE, using only a set square without the need for other tools for technical drawing. The sheet has a graduated frame that allows you to draw all the vertical and horizontal lines of the perspective. Once the horizon line and the vanishing point (or the two vanishing points) have been established, the perspective can be drawn using the millimeter rulers printed on the edges of the sheet.
In the images, some works created with these worksheets, other ideas about perspective are here https://arteascuola.com/?s=perspective
