diff --git a/index.html b/index.html
index 5e00f95..1e41e64 100644
--- a/index.html
+++ b/index.html
@@ -40,6 +40,9 @@
 		.reveal .hidden {
 			display: none
 		}
+		.reveal .metaphor {
+			color: purple;
+		}
 		.reveal .pathfinder-rerun {
 			z-index: 1000;
 			position: fixed;
diff --git a/slides/discipline.md b/slides/discipline.md
index 708a245..16fb5f9 100644
--- a/slides/discipline.md
+++ b/slides/discipline.md
@@ -11,9 +11,32 @@ but your emotions do something else.
 
 ### Elephant Rider
 
+- metaphor describing our internal interactions
+- elephant = emotional side
+- rider = rational side
+
+-V-
+
+The **rider** is tiny but intelligent,<br />holding the reigns and choosing the right path.
+
+The **elephant** is huge but simple,<br />with a mind of its own.
+
+-V-
+
+Most of the time, the elephant let's the rider lead the way.
+
+But at 6 tons it won't be bossed around! <!-- .element: class="fragment" -->
+
+-V-
+
+If the rider is indecisive or tired,<br />the elephant will do as it likes.
+
+If the elephant gets scared,<br />it will not obey the rider.
+<!-- .element: class="fragment" -->
+
 ---
 
-### Cognitive resource
+### Ego depletion
 
 - capacity, depleting, replenishing, growing
 
diff --git a/slides/motivation.md b/slides/motivation.md
index 374b53c..1d83a92 100644
--- a/slides/motivation.md
+++ b/slides/motivation.md
@@ -305,3 +305,8 @@ Starting small is fine, as long as you start!
 ### My Start
 
 I started fixing defects in Android apps I use.
+
+It covers:
+- coding useful software
+- learning from others
+- sharing code publicly