Echoing with the trickling sounds of falling water, the flutter of bat wings, or perhaps only your footsteps, a journey into the earth starts at the mouth of a cave.Each cover in the Dark Matter series celebrates the beauty found in darkness and the scenes made by the faintest light. Let your creativity run wild in the black pages of this Into the Earth: Caves Notebook.This extra-thick 120 gsm black paper works great with gel pens (for the brightest colors, look for ones formulated to work on dark media, like our Supernova Pens), metallic pens, pastels, and even some paints!