diff --git a/slides/223015b/assets/demos/aliasing-paar.html b/slides/223015b/assets/demos/aliasing-paar.html
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+<!DOCTYPE html>
+<html lang="de">
+<head>
+<meta charset="UTF-8">
+<title>Aliasing — derselbe Fehler in zwei Sinnen</title>
+<style>
+  :root {
+    --dark: #1a1a2e;
+    --muted: #6b7280;
+    --soft: #f8fafc;
+    --border: #cbd5e1;
+    --hl: #d63384;
+    --audio: #ea580c;
+    --bild: #2563eb;
+  }
+  html, body { margin: 0; padding: 0; background: #fff; font-family: system-ui, -apple-system, sans-serif; color: var(--dark); }
+  body { padding: 30px 40px; }
+  h1 { text-align: center; margin: 0 0 6px; font-size: 1.75rem; }
+  .sub { text-align: center; color: var(--muted); margin-bottom: 24px; font-size: 1.05rem; }
+  .sub strong { color: var(--dark); }
+
+  .pair {
+    display: grid;
+    grid-template-columns: 1fr 1fr;
+    gap: 22px;
+    max-width: 1200px;
+    margin: 0 auto;
+  }
+
+  .modality {
+    border: 2px solid;
+    border-radius: 12px;
+    padding: 16px 18px;
+    background: #fff;
+    display: flex;
+    flex-direction: column;
+    gap: 12px;
+  }
+  .modality.audio { border-color: var(--audio); }
+  .modality.bild  { border-color: var(--bild); }
+
+  .mod-head { display: flex; justify-content: space-between; align-items: baseline; }
+  .mod-name { font-size: 1.25rem; font-weight: 700; }
+  .modality.audio .mod-name { color: var(--audio); }
+  .modality.bild  .mod-name { color: var(--bild); }
+  .mod-tag { font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.12em; color: var(--muted); }
+
+  .canvas {
+    background: var(--soft);
+    border-radius: 8px;
+    overflow: hidden;
+  }
+  .canvas svg { display: block; }
+
+  .scene-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
+  .scene { display: flex; flex-direction: column; gap: 4px; }
+  .scene-label {
+    font-size: 0.68rem;
+    font-weight: 700;
+    text-transform: uppercase;
+    letter-spacing: 0.1em;
+    color: var(--muted);
+  }
+  .scene-cap {
+    font-size: 0.78rem;
+    color: var(--muted);
+    line-height: 1.4;
+    font-family: ui-monospace, monospace;
+  }
+  .scene-cap strong { color: var(--dark); }
+
+  .ear-eye {
+    font-size: 0.86rem;
+    line-height: 1.5;
+    color: var(--dark);
+  }
+  .ear-eye .arrow { color: var(--hl); font-weight: 700; }
+  .ear-eye-headline {
+    font-size: 0.9rem;
+    font-weight: 700;
+  }
+  .modality.audio .ear-eye-headline { color: var(--audio); }
+  .modality.bild  .ear-eye-headline { color: var(--bild); }
+
+  .verdict {
+    margin-top: 22px;
+    max-width: 1200px;
+    margin-left: auto;
+    margin-right: auto;
+    text-align: center;
+    border: 2px solid var(--hl);
+    border-radius: 12px;
+    padding: 14px 22px;
+  }
+  .verdict-q { font-size: 1.1rem; font-weight: 700; color: var(--hl); }
+  .verdict-a { font-size: 0.93rem; color: var(--dark); margin-top: 4px; }
+  .verdict-a strong { color: var(--hl); }
+</style>
+</head>
+<body>
+  <h1>Aliasing — derselbe Fehler in zwei Sinnen</h1>
+  <div class="sub">Was im Ohr <strong>Brummen</strong> macht, macht im Auge <strong>Moiré</strong>. Wurzel: Sampling zu grob.</div>
+
+  <div class="pair">
+
+    <div class="modality audio">
+      <div class="mod-head">
+        <span class="mod-name">Audio</span>
+        <span class="mod-tag">Unterabtastung</span>
+      </div>
+
+      <div class="scene-pair">
+        <div class="scene">
+          <div class="scene-label">Original (18 kHz)</div>
+          <div class="canvas">
+            <svg viewBox="0 0 280 80" width="100%" height="80" preserveAspectRatio="none">
+              <line x1="0" y1="40" x2="280" y2="40" stroke="#cbd5e1" stroke-width="1" stroke-dasharray="3,4"/>
+              <path d="M0,40 Q7,5 14,40 T28,40 T42,40 T56,40 T70,40 T84,40 T98,40 T112,40 T126,40 T140,40 T154,40 T168,40 T182,40 T196,40 T210,40 T224,40 T238,40 T252,40 T266,40 T280,40"
+                    stroke="#ea580c" stroke-width="2" fill="none"/>
+            </svg>
+          </div>
+          <div class="scene-cap">20 Schwingungen<br>schnelle Welle</div>
+        </div>
+        <div class="scene">
+          <div class="scene-label">Bei 22 kHz gesampelt</div>
+          <div class="canvas">
+            <svg viewBox="0 0 280 80" width="100%" height="80" preserveAspectRatio="none">
+              <line x1="0" y1="40" x2="280" y2="40" stroke="#cbd5e1" stroke-width="1" stroke-dasharray="3,4"/>
+              <path d="M0,40 Q7,5 14,40 T28,40 T42,40 T56,40 T70,40 T84,40 T98,40 T112,40 T126,40 T140,40 T154,40 T168,40 T182,40 T196,40 T210,40 T224,40 T238,40 T252,40 T266,40 T280,40"
+                    stroke="#fed7aa" stroke-width="1.2" fill="none"/>
+              <path d="M0,40 Q70,10 140,40 T280,40"
+                    stroke="#ea580c" stroke-width="2.5" fill="none"/>
+            </svg>
+          </div>
+          <div class="scene-cap"><strong>2 Schwingungen</strong><br>Brumm-Frequenz</div>
+        </div>
+      </div>
+
+      <div class="ear-eye">
+        <div class="ear-eye-headline">Was das Ohr hört</div>
+        Ein schriller 18-kHz-Ton wird zu einem dumpfen 4-kHz-Brumm. Das hohe ist <strong>nicht leiser</strong> — es ist <strong>verloren und falsch ersetzt</strong>.
+      </div>
+    </div>
+
+    <div class="modality bild">
+      <div class="mod-head">
+        <span class="mod-name">Bild</span>
+        <span class="mod-tag">Moiré-Effekt</span>
+      </div>
+
+      <div class="scene-pair">
+        <div class="scene">
+          <div class="scene-label">Original (feine Streifen)</div>
+          <div class="canvas">
+            <svg viewBox="0 0 280 80" width="100%" height="80" preserveAspectRatio="none">
+              <defs>
+                <pattern id="fine-real" x="0" y="0" width="3" height="80" patternUnits="userSpaceOnUse">
+                  <rect x="0" y="0" width="1.5" height="80" fill="#1e3a8a"/>
+                </pattern>
+              </defs>
+              <rect x="0" y="0" width="280" height="80" fill="url(#fine-real)"/>
+            </svg>
+          </div>
+          <div class="scene-cap">93 Linien<br>volle Auflösung</div>
+        </div>
+        <div class="scene">
+          <div class="scene-label">In niedriger DPI gerendert</div>
+          <div class="canvas">
+            <svg viewBox="0 0 280 80" width="100%" height="80" preserveAspectRatio="none">
+              <defs>
+                <linearGradient id="moire-bands" x1="0" y1="0" x2="1" y2="0">
+                  <stop offset="0%"  stop-color="#1e3a8a"/>
+                  <stop offset="10%" stop-color="#bfdbfe"/>
+                  <stop offset="20%" stop-color="#1e3a8a"/>
+                  <stop offset="30%" stop-color="#bfdbfe"/>
+                  <stop offset="40%" stop-color="#1e3a8a"/>
+                  <stop offset="50%" stop-color="#bfdbfe"/>
+                  <stop offset="60%" stop-color="#1e3a8a"/>
+                  <stop offset="70%" stop-color="#bfdbfe"/>
+                  <stop offset="80%" stop-color="#1e3a8a"/>
+                  <stop offset="90%" stop-color="#bfdbfe"/>
+                  <stop offset="100%" stop-color="#1e3a8a"/>
+                </linearGradient>
+              </defs>
+              <rect x="0" y="0" width="280" height="80" fill="url(#moire-bands)"/>
+            </svg>
+          </div>
+          <div class="scene-cap"><strong>5 breite Bänder</strong><br>Moiré-Frequenz</div>
+        </div>
+      </div>
+
+      <div class="ear-eye">
+        <div class="ear-eye-headline">Was das Auge sieht</div>
+        Feine Linien sind weg, dafür <strong>breite Streifen</strong>, die nie da waren. Aus 93 Linien werden 5 Bänder — das Bild lügt.
+      </div>
+    </div>
+
+  </div>
+
+  <div class="verdict">
+    <div class="verdict-q">Aliasing kennt keine Modalität. Es ist ein <strong>mathematischer</strong> Fehler — kein technischer.</div>
+    <div class="verdict-a">Egal ob Ton, Bild, Video, Radar, GPS — Sampling muss immer mindestens <strong>doppelt</strong> so dicht sein wie das Signal. Sonst tauscht die Realität Frequenzen aus.</div>
+  </div>
+</body>
+</html>
diff --git a/slides/223015b/assets/demos/aliasing-paar.png b/slides/223015b/assets/demos/aliasing-paar.png
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