Casting a paper wasp nest

Paper wasps build nests using fibers to form a paper like substance.

Inside, they look like this:


I made some foam and paper sprues

and attached them to the nest fragments with masking tape:

These were packed in loose sand (shake gently while doing this).

The molten aluminum was poured in the sprues.

This is the resulting rough casting:

This is the back, with the sprue still attached>