Now try this base for yourself: -

which means fold layers 1 and 2 together putting point 2 on top of point T.

(we always count the maximum number of layers involved in the paper we are

using in the fold).

Now here is a model to try:-

A square.

Notes:-

line from point 3 to point 2.

A (without brackets) is a point identifiable as the junction of the edge or boundary of a previous fold and the outer boundary of the fold so far. It may also be the junction of two existing edges within the perimeter of the fold. Note here A is on same line as 2

Notice we are only counting the two layers actually involved in the fold. Our symbols are in general limited to what is necessary for the particular fold.

We can now look at more powerful ways of defining locations and folds and the developments in the definition matrix.

Key to model E Kenneway - Simple Origami, page 6 & 7. (C) E. Kenneway 1970.

Key to base, Diamond.