lines: add escape square, smaller previews

index.html

@@ -144,6 +144,11 @@
           <img src="/static/hedges.png"></img>
         </a>
       </div>
+      <div class="gridify">
+        <a href="http://alpha.editor.p5js.org/full/BkPiP42tG">
+          <img src="/static/escape_square.png"></img>
+        </a>
+      </div>
     </div>
     <div class="section">
       <p>