Moulding Tunnel

A word extrudes a tunnel — frame after frame after frame of ornamental moulding, receding to a vanishing point — and then pulls you through it. The profile is grown from the seed, so every word carves a different corridor of filaments and plates, and the flight never quite repeats.

It's the forge's ornament again, but turned inside out: instead of a framed object, you're inside the frame, falling down its length. Type a word to cut a new tunnel.