Welcome to 
(1) click in background to get context menu 
(2) this is a browser to view and edit file in a repository
(3) this is a workspace 
// here you can evaluate code... // by selecting it and pressing CTRL+D (do it) or CTRL+P for doing and priting it: 3 + 4 // 7 // or for(let ea of Array.from(document.body.children)) { lively.showElement(ea) // ea.remove() // } // 5. HOMEWORK change the script to have a clean start