The Art of Problem Posing

[size=200]"What if each attribute were not so; what could it be then?"[br][/size]
[i]Brown & Walter, 2005[br][url=https://www.amazon.com/Art-Problem-Posing-Stephen-Brown/dp/0805849777]https://www.amazon.com/Art-Problem-Posing-Stephen-Brown/dp/0805849777[/url] [/i]
– Steve Phelps

Information: The Art of Problem Posing