-<li>NanoVNA case
-<br/><a href="RF/NanoVNA%20case/index.html"><img style="width:100%; max-width:500px;" src="
- RF/NanoVNA%20case/make.png
+<li>Portable stereo speaker
+<br/><a href="misc/portable%20stereo%20active%20speaker/index.html"><img style="width:100%; max-width:500px;" src="
+ misc/portable%20stereo%20active%20speaker/make.png
+ "></a>
+</li>
+
+<li>Headphone hub
+<br/><a href="misc/headphone%20hub/index.html"><img style="width:100%; max-width:500px;" src="
+ misc/headphone%20hub/make.png
+ "></a>
+</li>
+</ul>
+</div>
+</div>
+</div>
+
+<div id="outline-container-sec-4" class="outline-2">
+<h2 id="sec-4"><span class="section-number-2">4</span> Optics</h2>
+<div class="outline-text-2" id="text-4">
+<ul class="org-ul">
+<li>35mm film copying device
+<br/><a href="optics/35mm%20film%20copying%20device/index.html"><img style="width:100%; max-width:500px;" src="
+ optics/35mm%20film%20copying%20device/make.png