Question: Create a crisp crease in a fabric square folded in half.
Options:
Fold the fabric square in half.  Place in a magazine and close.  Stack a couple more thin magazines underneath.  Leave overnight.
Fold the fabric square in half.  Place in a book and close.  Stack a couple more thick books on top.  Leave overnight.
Answer: Fold the fabric square in half.  Place in a book and close.  Stack a couple more thick books on top.  Leave overnight.