When we talk about open storage, we mean cabinets with glass doors or open shelves. Closed storage are your standard solid cabinet doors. You want a mix of both for a few reasons, first of all - you’ll want to have closed storage for function, to hold and disguise all of your things that aren’t necessarily the prettiest to look at. But you’ll also want some open storage. This helps break up the space visually, add a detail and some visual interest, and allows you to display things that are either beautiful or used daily (for example, a nice set of dishes, or large servingware).