17.
For the steps #18-20, we will be working on the inner foldings given in this creases pattern.
If you miss any of steps, you can come back to this CP to figure out missing steps.
18.
Move one corner to the left.
Prepare to apply a valley-fold.
Have you got a Brook in your little heart, Where bashful flowers blow, And blushing birds go down to drink, And shadows tremble so -- And nobody knows, so still it flows, That any brook is there, And yet your little draught of life Is daily drunken there -- Why, look out for the little brook in March, When the rivers overflow, And the snows come hurrying from the fills, And the bridges often go -- And later, in August it may be -- When the meadows parching lie, Beware, lest this little brook of life, Some burning noon go dry!