Conker (Magic Casket)

Cabinet-maker, could you craft me a conker? Oil its wood, burnish its veneer, set it glowing from within? Never, not a chance, no hope at all King, then, could you command me a conker? Compel its green spikes to grow, its white plush to thicken? Impossible, impractical, inconceivable Engineer, surely you could design me a conker? Refine its form, mill its curves and edges? Manufacture me that magic casket? Unfeasible, unworkable, unimaginable Realize this (Said the Cabinet-maker, the King and the Engineer together) Conker cannot be made, however you ask it Whatever word or tool you use, regardless of decree Only one thing can conjure conker And that thing Is tree