Onion Skin

Onion skins are when you open an existing project and are able to use where you finished off with the last frame and line upyour new frame if you wish to continue. It allows you to line up the frames so that you can set up your stage and props, looking as though it remained the same the entire time. It allows you to see the two layers, one almost transparent and this is how you can libne them up. If the onion skin was not available, it woud be basically impossibvle to film on different days without that being obvious.