Pascal Square

On this page are instructions for a unit to finish off a "pascal triangle" model, but in a square shape. In this example we'll end up with a 4 by 4 square, and so we create a 3 by 3 square using the usual units as descrbed on the pascal triangle page. So, the story so far in this case looks like the folowing, on the front and back:

If you want to end up with an X by Y size rectangle, start with an X-1 by Y-1 size rectangle at this step.

On this page we're using the stronger locking method of joining the units, as described here.

Finishing unit for a square pattern:

Not all the finishing edge units are identical. We start off desribing the unit to be added to the right side of the model (looking from the back); units on the other side are the mirror image of this.

First start with the precreasing as for the basic unit, up to step 7 on the pascal triangle page:

Now proceed as follows:

1. Fold an extra diagonal:

2. and the same on the other side:

3. Then the unit is folded as in step 8 of the basic unit:

4. Fold over a corner:

5. Bring up the flap. (This is assuming you will join the units with the stronger locking method; if you are just using the simpler method you can miss this step).

6. Fold up the bottom right edge, and bring down the bottom left corner. All the creases required are already made.

7. Flattened after the pervious step:

8. Now bring up the lower right corner:

9. The pictures in this row show several views of the lower right corner being lifted up to the upper left area, as shown:

The end unit is now completed. For end units for the left side of the model, fold the mirror image of this.

Joining the first right hand end unit to the model:

1. Bring back down the corner folded across the model in the last step of creating the unit. Put the unit in place next to the rest of the model:

2: Lock together following the locking instructions . Here the lock is half completed:

3. Now the unit is locked in place:

4. Now the lower right corner flap can be folded back across the model:

5. And the corner tucked into the model as shown:

6. Now it's in place:

7. The whole model now looks like this:

8. And we're ready to add the next unit along this edge:

Joining the second right hand end unit to the model:

1. Move the second unit of this edge into place:

2. Once slotted into position,

3. it is locked in place. Locking half done:

4. Lock completed:

5. Fold the bottom part of the unit as for the previous unit added:

6: Then bring the flap up and over:

7: And tuck it in:

8. The model now looks like this:

The third unit along this edge is joined in exactly the same way as the second unit, and you'll end up with something like this:

The lower left edge:

The units on this edge are attached as for the right edge, but you must fold mirror image versions. The very last unit will reqire a slightly different folding, as shown below.

1. This row shows the first unit on the left lower edge being attached: