of liquid acrylic poured through it.
The thing is heavier than you can imagine and hard to move. It is an african tree (I forget the name off hand) that has thorns on it. The tree gets gaping holes in it as it grows old (where bats then live), so to make it solid it had to have the acrylic pour. The thorns were shaved down so that it could be a table. It had belonged to a friend who passed away and left it to me. I love it so very much.