diff --git a/public/js/webgl-book-shape-lab.js b/public/js/webgl-book-shape-lab.js
index d15d1f3..441949a 100644
--- a/public/js/webgl-book-shape-lab.js
+++ b/public/js/webgl-book-shape-lab.js
@@ -247,8 +247,8 @@ function createClothSpineGeometry(depth, spineWidth) {
     };
 
     profile.forEach((point) => {
-        front.push(push(point, depth * 0.5 + 0.012));
-        back.push(push(point, -depth * 0.5 - 0.012));
+        front.push(push(point, depth * 0.5 + 0.024));
+        back.push(push(point, -depth * 0.5 - 0.024));
     });
     for (let i = 0; i < profile.length - 1; i += 1) {
         indices.push(front[i], back[i], front[i + 1]);
@@ -280,7 +280,7 @@ function simulatePageLines(bundleCount, pageWidth, spineWidth) {
     const stepLength = pageWidth / segments;
     const entries = [];
     const spineSamples = sampleSpineByArc(bundleCount, spineWidth);
-    const leftLimit = Math.floor((bundleCount - 1) * readingProgress);
+    const leftLimit = Math.min(bundleCount - 2, Math.floor((bundleCount - 1) * readingProgress));
     for (let index = 0; index < bundleCount; index += 1) {
         const t = spineSamples[index].t;
         const side = index <= leftLimit ? -1 : 1;
@@ -687,13 +687,26 @@ function addSimulatedPageLines(lines, depth) {
 function addSimulatedStackBodies(lines, depth) {
     [-1, 1].forEach((side) => {
         const sideLines = lines.filter((line) => line.side === side);
-        if (sideLines.length < 2) return;
+        if (!sideLines.length) return;
         const material = side < 0 ? materials.pagesLeft : materials.pagesRight;
-        book.add(new THREE.Mesh(createLoftedLineBody(sideLines, depth), material));
-        book.add(new THREE.Line(createEndpointPolyline(sideLines, depth), new THREE.LineBasicMaterial({ color: 0xb99a68, transparent: true, opacity: 0.62 })));
+        const bodyLines = sideLines.length === 1 ? createSinglePageBodyLines(sideLines[0]) : sideLines;
+        book.add(new THREE.Mesh(createLoftedLineBody(bodyLines, depth), material));
+        book.add(new THREE.Line(createEndpointPolyline(bodyLines, depth), new THREE.LineBasicMaterial({ color: 0xb99a68, transparent: true, opacity: 0.62 })));
     });
 }
 
+function createSinglePageBodyLines(line) {
+    const bundleCount = Math.max(4, Math.round(pageCount / 10));
+    const supportPoints = line.points.map((point) => ({
+        x: point.x,
+        y: Math.max(coverTopYAtX(point.x) + coverClearance(bundleCount), point.y - BOOK_PROFILE.bundleSpacing)
+    }));
+    return [
+        { ...line, points: supportPoints, endpoint: supportPoints[supportPoints.length - 1] },
+        line
+    ];
+}
+
 function createLoftedLineBody(lines, depth) {
     const positions = [];
     const indices = [];