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Beyond four walls
While it is true that four points for an envelope is limited, there are ways of extending the mould capabilities and this tutorial would not be complete without
at least mentioning them.
Multiple applications
 If you apply one envelope on top of another, the original
one is replaced. But if you convert your moulded object to editable shapes (Arrange > Convert to Editable Shapes) in between, the effects are compounded. Applying one envelope on top
of another is not always predictable but can be interesting. Illustrated here are multiple applications of twirl, circular/tv and deco envelopes. The original circular mould
object has been subjected to alternate tv and circular envelopes, the tv envelope having been designed for the purpose.
A mould matrix
If you can divide your object into sections you can apply an envelope to each:
 The example on the right shows what happens if you apply a
wave envelope to adjacent sections of the object. No special stretching was required in this case.
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You can create sets of ready made shapes that fit together.
Stretching to fit shapes can get a bit complicated, so always use a copy as a template. One thing I have not managed to do is to get a convincing 'twirl' mould. Any ideas?
And here's the solution to that diamond mould problem
mentioned on page 2. Although a diamond has 4 points you'll need 2 envelopes to keep the points in balance.
