Clearing out the attic and found this heavy metal base covered in sharp spikes

When I pulled it free, dust fell away in a cloud.

And there it was.

A circular metal base.

About the size of a large plate.

Dark brown with rust.

Covered on one side with dozens of evenly spaced, cone-shaped spikes.

Each spike was sharp.

Intentionally sharp.

Not decorative.

Not random.

Functional.

I remember instinctively hesitating before even touching it.

Because it didn’t look like something you simply “find in a house.”

It looked like something with a purpose.

A strong purpose.

One I didn’t immediately understand.

First Impressions: Alarm and Curiosity
My first thought was simple:

“What is this thing supposed to do?”

My second thought was slightly more dramatic:

“Why was this in my house?”