Both are great. The interesting thing about the B&W version is that each time I looked at it (glancing away for a second and then looking back) I seemed to see something different in it. At each glance it'd look like tar, then grease, then tree bark, etc. I guess the fact that it was B&W, i.e. just shadow and light, with no color to suggest what it actually was, it allowed my imagination to run wild. Lots of fun.