1.   The insects filled a cavity as large as I was.

2.   Although chalk is a very pure limestone it is mechanically too weak to allow the development of large underground cavities.

3.   But the leap from small brain plus large spinal cavity to second brain was only conjectural.

4.   Large cavities have been cut in the chests of the figures at Brandeis, so you see and hear their beating hearts, which are pulsing red lights.