ジェイコブ is capably navigating not only the bumps and crevices on the 床, but also invisible buildings and other sorts of obstacles which inhabit the inner 空間／宇宙 his 4th 次元の 靴（複） are walking through. Here we see what he sees as he turns past the 鋭い edge of a noise-walled 建物.     一度暗闇の中へ旅立てば きっと誰かがついてくるはずだ