By clicking on the Add Lookbook section, LOOKCAST suggests the theme choise for the new Lookbook before creating it with EDITOR.
Fulton: it's a theme optimized for a portrait display and it's perfect for mobile Campaigns. Thanks to the vertical scrolling, user gets a smooth and continuous content showing, useful for storytelling.
Morlen: this theme looks like the printed catalogs layout thanks to the landscape displaying of the contents. Pages are "slide show" browsed.
Once selected the theme, it won't be possible to change it anymore.