cones

The other day I was talking to my friend A--I was talking about calla lilies, and I said how the flowers are shaped like a cone. He thought I meant pine cone, but I meant like in geometry. Then I was thinking about how pine cones aren't cones at all. Wikipedia says they're called cones because some look like cones. Anyway, I think of cones as empty, like an ice cream cone. But I guess in geometry they're solid.