I always thought clocks were really cool so I wanted to make a simple graham mechanism to understand how it works and tells time.  The video of it sort of working is below, and I love the sound it makes. I wish I could find a way to redesign and mount it on my wall, but I can't/won't drill into my wall. 

To start. I used this video by Jacques Favre's on how to design a simple escapement: Video