Waves
First of all, we need to fold both sides of the Waves shape (where the red triangles are) in a zigzag
Fold both sides in a zigzag 
Fold both sides in a zigzag 
It should look like this 
Now put glue on the back side of the arrows, to glue them together 
Waves part folded & glued
This is important!
We want the waves to have some room to move, so we’re NOT going to glue all along the window. Glue the top part, till about 4 cm from the center fold.
This is important! We want the waves to have some room to move, so we’re NOT going to glue all along the window. Glue the top part, till about 4 cm from the center fold. 
Now we put glue on the back side of our card window. Important: Make sure you don’t put glue where the waves will be, so they have room to move! 
Can you wiggle the waves?
Hurray!
Now we add the popping bits and we’re done. Nearly there…
(you know the drill – we continue in the next post)