Marble staircase following vein.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...s_fullsize.jpg
https://s3-us-west-1.amazonaws.com/h...ain_stairs.jpg
Previously:
https://www.homemadetools.net/forum/...380#post161852
https://www.homemadetools.net/forum/...2093#post95470
https://www.homemadetools.net/forum/...096#post130120
https://www.homemadetools.net/forum/...354#post107152