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Work with the top layer of paper only. Fold the top corner down so it meets with the bottom-right corner (connect red dots). |
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As you do this, the bottom-left corner will lift up. Bring the bottom-left corner to the bottom-right corner (connect blue and red dot). |
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Make a mountain fold so the flaps can compress flat. |
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Done. |
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Side view. |
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Top view when one side has been completed. |
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Top view when all 4 sides are done. |
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To make the next steps easier, unfold the model completely and reinforce the relevant creases. This is how the crease pattern looks like. |
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Reinforce creases: mountain fold along the horizontal and vertical. Valley fold along the diagonal. |
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Reinforce creases: mountain fold along the edges. |
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Reinforce creases: mountain fold near the center of the paper. |
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The relevant creases shown. |
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This is how it looks like. |
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Refold the blintz base, then collapse into a waterbomb base. Start step 11 by making the valley folds as shown. |
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Fold the bottom flaps under. |
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At the same time, pinch the model so the edges come together. (Valley fold at the center crease; red dots and blue dots join). |
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In transition. |
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Almost there. |
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Done. |
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To lock the folds in place, turn the model over. Notice the 4 ridges. Push the top-ridge towards the left. Push the bottom-ridge towards the right. |
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Your goal is to compress the peak (blue dot) into a flat square. |
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Hold still the left-corner (red dot) and push up the right-corner. Notice the center peak starting to stretch out and expand. |
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Press the top-corner and bottom-corner away from one another. Keep doing these two moves until the center flattens out. |
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After a while, the center peak is low enough to squash down into a flat square.
Origami experts will be able to make a perfectly squashed square. For the rest of us, just try your best. |
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This is how it looks like when all 4 sides have been done. The procedure gets harder with the smaller units. |
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Top view. |
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Side view. Repeat with the other units of the origami Fir Tree. |