Snow knife
![Snow knife](https://www.historymuseum.ca/blog/wp-content/uploads/2017/01/couteau_neige_snow_knife-IMG2008-0583-0084-Dm.jpg)
Canadian Museum of History, IV-C-3256, IMG2008-0583-0084-Dm
Not so long ago, snow was the main building material in the Canadian North. People used snow knives like this one to build igloos — cutting blocks out of hard, compacted snow and trimming them so they fit together.