triceratops.PDF

Triceratops

by Jerry Harris

Begin with a square, white side up, with the vertical diagonal precreased. A square of 10" results in a

model of approximately 5.8" long and 1.67" tall at the hip.

Valley fold the left edge in half,

creasing only at the very edge, and

unfold.

Valley fold 1/4 at the left side, again

creasing only at the edge, and unfold.

Valley fold 1/8 at the left side, again

creasing only at the edge, and unfold.

This is the mark that is referred to in

Step 7.

1/3

2/3

Valley fold lower angle bisectors to

the center and unfold.

Valley fold, connecting the tops of the

angle bisectors, and unfold.

Valley fold through a point 2/3 the way

between the top point and the crease

connecting the angle bisectors (made

in Step 5) and unfold.

Valley fold the top point down so the

1/8 mark from Step 3 touches the

2/3 line from Step 6.

Reverse fold the top corners in to

the center, creating a small

preliminary base at the top.

Remake the angle bisectors

through the new flaps at the top

and unfold.

10.

11.

12.

Valley fold the top point down,

connecting the tops of the angle

bisectors.

Mountain fold the loose corners at

the sides under.

Reverse fold the top corners in to

the center, creating another

preliminary base at the top.

13.

14.

Valley fold the lower left side of the preliminary base at

the top in half. As you do this, you will have to squash

the flap underneath, folding the inner edge of the

colored flap to the outer edge.

The result. The first small preliminary base should lay

perfectly between the edges and the center, forming

1/4 of the larger one (made in Step 12). Valley fold the

angle bisector at the top, using only the top flap and

unfold (the model will not lay flat as you do this). Turn

over from side-to-side.

15.

16.

Valley fold the corresponding angle bisector on the

back. The paper will not lay flat as you do this, and

you'll have to crease the top part and bottom part

separately. Unfold.

Reverse fold the right side on the fold you just made.

Again, the paper will not lay flat. Turn back over from

side-to-side.

17.

18.

Invert the broad, raised point. The model will still not

lay flat, but will be concave instead of convex.

Valley fold the now concave flap down along the

crease made in Step 14, and flatten the model.

19.

20.

13-19 x1

The result. Fold the flap containing the small

preliminary base back down to the left.

Repeat Steps 13-19 in mirror image on the right side.

21.

22.

Collapse the square at the top as a preliminary base.

Valley fold the bottoms of the long, rectangular strips

to the center line and unfold.

23.

24.

Quadrisect the angle of the lower end of the

rectangular flaps. Note that the long, innermost folds

connect to the angle on the outside edge of the long

flap.

Reverse fold the left flap on the long, innermost

quadrisection line.

25.

26.

With only the uppermost flap of the reverse fold, begin

to fold it up to match the top point of the model. The

next few steps show more folds being made while this

is being done.

As you continue to fold the point up to the top, you

must push in the layer beneath it. The valley fold

beneath that is on an existing crease.

27.

28.

Now the point is closer to the top. Using existing

creases, fold the flap down to the left. It still won't lay

flat.

Flatten the model by valley folding the raised flap

down to the center line. The bottom half of this fold

occurs on an existing crease line.

29.

30.

24-28 x1

The result. Repeat Steps 24-28 on the right side.

Pull the uppermost, double-thickness top layer to the

right to expose the hidden layer beneath. The paper

will not lie flat.

31.

32.

Bisect the thick, hidden flap by valley folding its lower

edge to the center line.

Close the model over the hidden flap again.

33.

34.

Pull the uppermost, single-layer top flap to the left,

exposing another hidden flap (this is the same view as

Step 28).

Bisect the hidden flap. This will lock the fold of the

hidden flap folded in Step 31.

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