diff --git a/html/images/space.svg b/html/images/space.svg
index ab6c7f8..73adb55 100644
--- a/html/images/space.svg
+++ b/html/images/space.svg
@@ -153,21 +153,19 @@
       const delim = ' ';
       const className = 'clockwise-orientation';
 
-      triangles.forEach(triangle => {
-        const attr = triangle.getAttribute('points').split(delim);
-        const [[xa, ya], [xb, yb], [xc, yc]] = attr.map(t => t.split(',').map(n => +n));
-        const det = (xb - xa) * (yc - ya) - (xc - xa) * (yb - ya);
+      triangles.forEach(t => {
+        const attr = t.getAttribute('points').split(delim);
+        const [[xa, ya], [xb, yb], [xc, yc]] = attr.map(t => t.split(','));
+        const det = (+xb - +xa) * (+yc - +ya) - (+xc - +xa) * (+yb - +ya);
         const pos = `${positionX},${positionY}`;
-        const list = triangle.classList;
-        const clockwiseOrientation = det < 0;
+        const cwOrientation = det < 0;
 
         if (pos !== attr.pop()) {
           attr.push(pos);
-          triangle.setAttribute('points', attr.join(delim));
+          t.setAttribute('points', attr.join(delim));
         }
 
-        clockwiseOrientation ? list.add(className) : list.remove(className);
-
+        t.classList[cwOrientation ? "add" : "remove"](className);
         // i think i can also discard obtuse triangles?
 
         // if all the triangles are obtuse, i only need to check the nearest corner for a collision