Casing, in some applications, would be called a 'mother mold'. A casing is an additional component to the master block, which actually provides you with an outer perimeter fencing. It is the part, which dictates and encloses the outside of your mold.
Where a mother mold is actually an outer rigid form, helping to hold a rubber mold in place - casing is the part of a master block, that forms the outside of a mold.
An example of a casing, would be a cake pan. In the event of a cake, you simply want a uniform outside shape. You're not interested in an interior design. The same happens, when you add a casing to your master block.
The master block forms the interior design, while your casing forms the outside shape and form.
Using a casing with your master block, gives you the freedom to simply mix and pour your mold material (plasters or rubbers) into the master, as the mold material is then completely restrained into a form. Like just pouring into a box.
Without a casing, one has to continuously use the mold forms in its place. While a mold form is a handy way to provide walls around your original mold, it's hardly time efficient when producing subsequent molds off your master. By taking the time to build a casing, each of your master's are self contained and ready for pouring, at all times.
More about this is explained in my instruction e-books http://judysbookshop.com/ebooks.html
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