diff --git a/collage/collage.php b/collage/collage.php
new file mode 100644
index 0000000..f109cec
--- /dev/null
+++ b/collage/collage.php
@@ -0,0 +1,39 @@
+<?php
+	$id = isset($_GET['id']) ? $_GET['id'] : 9;
+	
+	// 2^0 (not hidden) and 2^9 (fully hidden)
+	$hidden = (int)rand(1,512);
+	$bits = decbin($hidden);
+	while (strlen($bits) < 9) $bits = '0' . $bits;
+	
+	$i = 0;
+?>
+
+<style>
+	img.black {
+		filter: brightness(0%);
+	}
+</style>
+
+<form action="collage.php" method="GET">
+	<input type="text" name="id" placeholder="Poseu un número de l'1 al 113..." />
+	<input type="submit" value="Actualitza foto" />
+</form>
+
+<table cellspacing="0" cellpadding="0">
+	<tr>
+		<td><img src="./imgs/<?=$id?>/slice_01_01.png" width="33" class="<?=(int)$bits[$i++] ? 'black' : ''?>" /></td>
+		<td><img src="./imgs/<?=$id?>/slice_01_02.png" width="33" class="<?=(int)$bits[$i++] ? 'black' : ''?>" /></td>
+		<td><img src="./imgs/<?=$id?>/slice_01_03.png" width="33" class="<?=(int)$bits[$i++] ? 'black' : ''?>" /></td>
+	</tr>
+	<tr>
+		<td><img src="./imgs/<?=$id?>/slice_02_01.png" width="33" class="<?=(int)$bits[$i++] ? 'black' : ''?>" /></td>
+		<td><img src="./imgs/<?=$id?>/slice_02_02.png" width="33" class="<?=(int)$bits[$i++] ? 'black' : ''?>" /></td>
+		<td><img src="./imgs/<?=$id?>/slice_02_03.png" width="33" class="<?=(int)$bits[$i++] ? 'black' : ''?>" /></td>
+	</tr>
+	<tr>
+		<td><img src="./imgs/<?=$id?>/slice_03_01.png" width="33" class="<?=(int)$bits[$i++] ? 'black' : ''?>" /></td>
+		<td><img src="./imgs/<?=$id?>/slice_03_02.png" width="33" class="<?=(int)$bits[$i++] ? 'black' : ''?>" /></td>
+		<td><img src="./imgs/<?=$id?>/slice_03_03.png" width="33" class="<?=(int)$bits[$i++] ? 'black' : ''?>" /></td>
+	</tr>
+</table>