Before revision: A collection of nutcrackers Types of collection 220px|alt=text|Stamp album used for collecting stamps The most obvious way to categorize collections is by the type of objects collected.
After revision: A collection of nutcrackers Types of collection 220px|alt=text|Stamp album used for collecting postage stampsNumismatic and philatelic collectable specimens on display at an exhibition in India The most obvious way to categorize collections is by the type of objects collected.