diff --git a/config/apache/standardebooks.org.conf b/config/apache/standardebooks.org.conf
index b8872ac7..2355de28 100644
--- a/config/apache/standardebooks.org.conf
+++ b/config/apache/standardebooks.org.conf
@@ -78,6 +78,7 @@ Define webroot /standardebooks.org/web
 	ServerAlias		www.${domain}
 	DocumentRoot		${webroot}/www
 	ErrorDocument		404	/404
+	ErrorDocument		451	/451
 	ErrorLog		/var/log/local/www-error.log
 	DirectorySlash		Off
 	RewriteEngine		on
diff --git a/config/apache/standardebooks.test.conf b/config/apache/standardebooks.test.conf
index 6339917c..2794ca72 100644
--- a/config/apache/standardebooks.test.conf
+++ b/config/apache/standardebooks.test.conf
@@ -61,6 +61,7 @@ Define webroot /standardebooks.org/web
 	ServerAlias		www.${domain}
 	DocumentRoot		${webroot}/www
 	ErrorDocument		404	/404
+	ErrorDocument		451	/451
 	ErrorLog		/var/log/local/www-error.log
 	DirectorySlash		Off
 	RewriteEngine		on
diff --git a/www/404.php b/www/404.php
index d3c6b818..3d3f0ad6 100644
--- a/www/404.php
+++ b/www/404.php
@@ -1,7 +1,21 @@
 <?
 require_once('Core.php');
-?><?= Template::Header(['title' => 'We couldn’t find that document', 'description' => 'We couldn’t find that document.']) ?>
-<main class="center">
-	<h1>We couldn’t find that document.</h1>
+
+?><?= Template::Header(['title' => 'We Couldn’t Find That Document', 'highlight' => '', 'description' => 'We couldn’t find that document.']) ?>
+<main>
+	<section class="narrow has-hero">
+		<hgroup>
+			<h1>We Couldn’t Find That Document</h1>
+			<h2>This is 404 error.</h2>
+		</hgroup>
+		<picture data-caption="Blind Orion Searching for the Rising Sun. Nicolas Poussin, 1658">
+			<source srcset="/images/blind-orion@2x.avif 2x, /images/blind-orion.avif 1x" type="image/avif"/>
+			<source srcset="/images/blind-orion@2x.jpg 2x, /images/blind-orion.jpg 1x" type="image/jpg"/>
+			<img src="/images/blind-orion@2x.jpg" alt="A classical city is aflame as people scramble in the foreground."/>
+		</picture>
+		<p>We couldn’t find a document at the URL you specified. Did you mistype the URL?</p>
+		<p>If you arrived here from a link on the Standard Ebooks website, please <a href="/about#editor-in-chief">contact us</a> so that we can fix it.</p>
+		<p>If you arrived here from a link elsewhere on the web, please contact the site you came from to ask them to fix their link.</p>
+	</section>
 </main>
 <?= Template::Footer() ?>
diff --git a/www/451.php b/www/451.php
new file mode 100644
index 00000000..e16cea64
--- /dev/null
+++ b/www/451.php
@@ -0,0 +1,19 @@
+<?
+require_once('Core.php');
+
+?><?= Template::Header(['title' => 'This Ebook Is No Longer Available', 'highlight' => '', 'description' => 'This ebook is unavailable due to legal reasons.']) ?>
+<main>
+	<section class="narrow has-hero">
+		<hgroup>
+			<h1>This Ebook Is No Longer Available</h1>
+			<h2>This is 451 error.</h2>
+		</hgroup>
+		<picture data-caption="The Course of Empire: Destruction. Thomas Cole, 1836">
+			<source srcset="/images/the-course-of-empire-destruction@2x.avif 2x, /images/the-course-of-empire-destruction.avif 1x" type="image/avif"/>
+			<source srcset="/images/the-course-of-empire-destruction@2x.jpg 2x, /images/the-course-of-empire-destruction.jpg 1x" type="image/jpg"/>
+			<img src="/images/the-course-of-empire-destruction@2x.jpg" alt="A classical city is aflame as people scramble in the foreground."/>
+		</picture>
+		<p>This ebook is no longer available, due to legal reasons. This may occur if the book was erroneously thought to be in the U.S. public domain, but new evidence changed that determination.</p>
+	</section>
+</main>
+<?= Template::Footer() ?>
diff --git a/www/images/blind-orion.avif b/www/images/blind-orion.avif
new file mode 100644
index 00000000..7b9d9141
Binary files /dev/null and b/www/images/blind-orion.avif differ
diff --git a/www/images/blind-orion.jpg b/www/images/blind-orion.jpg
new file mode 100644
index 00000000..db1bf955
Binary files /dev/null and b/www/images/blind-orion.jpg differ
diff --git a/www/images/blind-orion@2x.avif b/www/images/blind-orion@2x.avif
new file mode 100644
index 00000000..dcfcae0b
Binary files /dev/null and b/www/images/blind-orion@2x.avif differ
diff --git a/www/images/blind-orion@2x.jpg b/www/images/blind-orion@2x.jpg
new file mode 100644
index 00000000..e442ef68
Binary files /dev/null and b/www/images/blind-orion@2x.jpg differ
diff --git a/www/images/the-course-of-empire-destruction.avif b/www/images/the-course-of-empire-destruction.avif
new file mode 100644
index 00000000..51535048
Binary files /dev/null and b/www/images/the-course-of-empire-destruction.avif differ
diff --git a/www/images/the-course-of-empire-destruction.jpg b/www/images/the-course-of-empire-destruction.jpg
new file mode 100644
index 00000000..2f2e05ae
Binary files /dev/null and b/www/images/the-course-of-empire-destruction.jpg differ
diff --git a/www/images/the-course-of-empire-destruction@2x.avif b/www/images/the-course-of-empire-destruction@2x.avif
new file mode 100644
index 00000000..a1495c81
Binary files /dev/null and b/www/images/the-course-of-empire-destruction@2x.avif differ
diff --git a/www/images/the-course-of-empire-destruction@2x.jpg b/www/images/the-course-of-empire-destruction@2x.jpg
new file mode 100644
index 00000000..8fbd44b1
Binary files /dev/null and b/www/images/the-course-of-empire-destruction@2x.jpg differ