A keystone in an arch's crown secures the other stones in place. Keystone species play the same role in many ecological communities by maintaining the structure and integrity of the community.

The term "keystone" resonates with a profound array of meanings across diverse domains, embodying critical elements in ...

The best way to do this is to distribute the weight evenly, and directly to the ground. The trough of the aquaduct could rest on the center and top of the arch, the keystone (red in the models). From ...

Miami-based Keystone Holdings Group proposes the 16-story Azul at Blue Lagoon building at 1200 Northwest 57th Avenue in unincorporated Miami-Dade County, according to Keystone’s application ...