I use this technique with two rulers many times when I’m drawing a building in perspective. It really helps me and my students see angles that can be very tricky to see. Sometimes, students will even see these angles in reverse! So this top will really help you to recreate more exact drawings in perspective.
To purchase the Gridded Ruler click the link below https://amzn.to/3mAkGNW
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For more in-depth online drawing tutorials & a forum with other drawing students & support from me: www.lzmstudio.com
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I have no relationship with the manufacturers/dealers of this product, I just have experience using it in my artwork/teaching.