Only the front of the square piece of paper is coloured.
Step 1:This is the front of the paper.
Turn the paper.
Step 2:
Make a valley-fold over these 2 lines.
Step 3:
Make a valley-fold over this line.
Step 4:
Fold the brown piece back to the right by making
a valley-fold over this line.
Step 5:
Make this valley-fold over the upper layer of the model.
The corner at the arrow goes a bit downwards (in the direction
of this arrow) when you make this fold.
Step 6:
Here a part of the fold in step 5 is already made.
Now, flatten everything by pressing on the model
from above.
Step 7:
Repeat step 5 and 6 on the other side of the model,
see the pink line.
Step 8:
Make a valley-fold over the line below, on the right.
Step 9:
Turn the model.
Step 10:
Fold the top of the tree to the backside by making
a mountain-fold on the line below.
Fold the top of the tree back to the front by making
a valley-fold over the upper line.
Step 11:
Repeat step 10 two more times over these 4 lines.
The christmas tree is ready!
I think this model looks great on a christmas card.
