{"product_id":"inverse-marble-run","title":"Inverse Marble Run","description":"\u003cp data-start=\"23\" data-end=\"93\" class=\"PDq2pG_selectionAnchorContainer\"\u003eRemove one marble… and watch the \u003cem data-start=\"56\" data-end=\"62\"\u003ehole\u003c\/em\u003e travel all the way to the top.\u003cspan aria-hidden=\"true\" class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"95\" data-end=\"475\"\u003eThe \u003cstrong data-start=\"99\" data-end=\"121\"\u003eInverse Marble Run\u003c\/strong\u003e turns the familiar marble run concept upside down. Instead of adding marbles and watching them roll down, the track starts completely filled. Remove a single marble from the bottom, and an empty space slowly climbs upward as each marble rolls down exactly one position. The result is a mesmerizing chain reaction that's surprisingly satisfying to watch.\u003c\/p\u003e\n\u003cp data-start=\"477\" data-end=\"809\"\u003eDesigning this puzzle was a major engineering challenge. Every slope had to be carefully tuned—too steep, and marbles would push each other out of the track; too shallow, and they wouldn't move at all. After more than a dozen prototypes, every angle, wall height, and spacing was refined to create a perfectly functioning mechanism.\u003c\/p\u003e\n\u003cp data-start=\"811\" data-end=\"1119\"\u003eThe track follows the famous \u003cstrong data-start=\"840\" data-end=\"857\"\u003eHilbert Curve\u003c\/strong\u003e, a mathematical space-filling curve that packs an impressively long path into a compact footprint. Whether displayed on your desk or demonstrated to friends, the Inverse Marble Run is both a fascinating kinetic sculpture and a celebration of clever engineering.\u003c\/p\u003e\n\u003cp data-start=\"1121\" data-end=\"1192\"\u003e\u003cstrong data-start=\"1121\" data-end=\"1134\"\u003eDesigner:\u003c\/strong\u003e Oskar van Deventer\u003cbr data-start=\"1153\" data-end=\"1156\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Puzzle Guy Store","offers":[{"title":"Small","offer_id":54812649193814,"sku":"OVD-060-1","price":46.0,"currency_code":"USD","in_stock":true},{"title":"Large","offer_id":54812649226582,"sku":"OVD-060-2","price":128.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/0127\/4966\/files\/ChatGPTImageJul25_2026_12_54_39PM.png?v=1784976892","url":"https:\/\/puzzleguy.store\/products\/inverse-marble-run","provider":"Puzzle Guy Store","version":"1.0","type":"link"}