Including UK VAT*

What You Will Learn

Investigate the power of lines in your glass work with this three-session online course, learning from renowned glass artist Bob Leatherbarrow. 

Lines are a powerful design element. They separate regions within and guide your eye around, a composition. Yet creating crisp, clean, and controlled lines has been a challenge for artists working with kiln-formed glass.  

 You can view more of Bob's work on his website here:

Bob Leatherbarrow Quality of Line Materials List 2024.pdf

Duration and Place

Duration: 3 weeks - a total of 6 hours

Online Course

Please note that classes may be slightly longer or shorter depending on student questions.

Session times

  • Wednesday 3rd April 2024 - 5.30 pm-7.30 pm UK time (2 hours)
  • Wednesday 10th April 2024 - 5.30 pm-7.30 pm UK time (2 hours)
  • Wednesday 17th April 2024 - 5.30 pm-7.30 pm UK time (2 hours)

Class Description

This 3-session class will cover a range of different techniques.  Learn six ways to create intricate, precise, and predictable patterns of straight, elegantly curved, or gestural lines. Discover how to make these lines join, intersect, and branch seamlessly. Create fine-coloured edges along the rim of slumped pieces that accentuate the shape of the bowl. 

Techniques outlined in this workshop can be incorporated into your favourite style to improve the composition and design of your piece. 

Workshop Outcomes:

  • Linear design samples
  • Glass pieces depicting multiple linear approaches using glass powders, mica, stringers, and modelling glass.
  • A finished piece of slumped glass with your own line design

How it Works: 

  • The course is made up of three live and interactive online sessions using the Zoom platform. You will find the zoom link via the week's chapters in the navigation panel.
  • Bob will give a step-by-step tutorial with demonstrations, and you will have ample opportunity to ask him questions during the live class
  • Each week he will demonstrate a technique for you to try between sessions
  • A member of the Glass School team will also be in the Zoom class to assist you and Bob
  • Mix with Bob and other students on our dedicated community page, open for the duration of the course. Then join our exclusive Glass School UK Online Glass Community Facebook group to continue to mix with those who have attended any of our online masterclasses
  • A materials list is provided in the course navigation panel, so you can purchase what you need to create your pieces during the course. You don’t need absolutely everything on this list to be successful, Bob will discuss different ways to reach our technical goals

We believe that this is the best way to get the very most from the course, but if this doesn’t suit you that’s fine: - If you can’t get to your studio, you can still learn the techniques and benefit from Bob's extensive knowledge without making the pieces during the course itself.

This is a live online masterclass, but in case a student experiences issues with internet connection during the live class, a recording of each live session will be available to view until two weeks after the final session. This cannot be downloaded or shared and is only available for this limited time. By participating you agree to be recorded for this purpose.

These recordings will be available in the course navigations panel. 

What to Prepare

  • You will need a computer, tablet, or phone with a camera and microphone in order to join the online classroom. If you are unfamiliar with using Zoom then please take some time to look at our guide, available in the navigation panel. 
  • You should have a reliable internet connection, fast enough to make video calls or stream videos
  • Please read the Student Participation Agreement
  • Ensure that you have checked the materials list and purchased any materials you may require 
  • A pen and paper to take any notes. 
  • We restrict the class size to 25 people
  • We teach using Bullseye Glass (CoE90)


We are committed to maintaining a respectful community where all our students can learn and develop their full potential, within a safe environment.

If you have a learning difference or any specific requirements, please do not hesitate to contact us prior to your lesson so we can accommodate you.

*Price excluding VAT is £112.50. The correct tax will be calculated at checkout based on your location.

There are 25 places available on this course. Our courses regularly reach that limit and so we advise booking a place at the earliest opportunity to avoid any disappointment. 

Cancellations up to 2 weeks before the course receive a 90% refund, after that date, a 50% refund will be given up to one week prior to the course, and no refund is given for cancellations after this time. In order to keep class costs low for all, we make no exceptions to this policy. In order to cancel your place on the course please contact [email protected]

Course Curriculum

    1. Welcome

    2. Course Overview

    3. Student Participation Agreement

    4. Join the Community!

    5. How to Navigate the Community Page

    6. Materials List

    7. How to Download your Materials List!

    8. A Guide to Zoom and the Live Session

    9. All Set for the First Session!

    1. Reactive Glass Chart

    1. Welcome to Week One

    2. Course Handout - Week One

    3. Zoom Link - Week One - The Quality of the Line - Wednesday 3rd April 2024

    4. Week One - Recording

    5. Quality of the Line Session 1

    1. Welcome to Week Two

    2. Course Handout - Week Two

    3. Zoom Link - Week Two - The Quality of the Line - Wednesday 10th April 2024

    4. Week Two - Recording

    5. Week Two - Presentation

    1. Welcome to Week Three

    2. Course Handout - Week Three

    3. Zoom Link - Week Three - The Quality of the Line - Wednesday 17th April 2024

    4. Week Three - Recording

    5. Week Three - Presentation

    1. Submit Your Finished Works

About this course

Bob Leatherbarrow

Bob has been creating with kilnformed glass for over 35 years and is known for innovative techniques, textures and colour palettes using glass powders. His glass bowls and sculptures explore the subtle hues and delicate beauty of naturally occurring textures and encourage the viewer to ponder their origin. Bob is dedicated to education and is a popular guest instructor as well as having written e-books on textured powders, firing schedules, and design. He lives in the artistic community of Salt Spring Island, Canada.

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Learn this unique technique and take your glass work to the next level