Green flag. (You can use cursor up/down if you want but it doesn't do anything useful!)
I wanted to start experimenting with the components to see how difficult it would be to write something that was based on a fixed skeleton. Turns out it actually is relatively complex to do it properly :-/ (this isn't properly - this is a naive and unrealistic quick hack) The image is from http://wiki.synfig.org/Doc:Cut-out_Animation