The author mentions [1] (at the bottom, under 'key bindings') that light table uses codemirror[2] as the editor.

I am really amazed with how well codemirror emulates basic vim key bindings [3], as I prefer to use ctrl-c rather than escape and I often find that vim emulators either do not support ctrl-c or do not support it well.

[1]http://www.chris-granger.com/2012/04/15/light-tables-numbers... [2]http://codemirror.net/ [3]http://codemirror.net/demo/vim.html