{"product_id":"silvia-levenson-negative-space-3rd-10th-17th-september-2026","title":"Silvia Levenson - Negative Space - 3rd, 10th, 17th September 2026","description":"\u003cp\u003eJoin Silvia to learn how to successfully cast glass using the box casting method. You will be introduced to different materials and applications to create negative space within your glass. You will focus on the reverse relief in an assembled mould, which will then determine your finished piece. \u003c\/p\u003e","brand":"Glass School","offers":[{"title":"Default Title","offer_id":54013900259661,"sku":"3781775","price":145.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0780\/9954\/6445\/files\/SilviaLevensonNegativeSpaceFeb.jpg?v=1780319922","url":"https:\/\/glass-school.co.uk\/products\/silvia-levenson-negative-space-3rd-10th-17th-september-2026","provider":"Glass School","version":"1.0","type":"link"}