I sometimes encounter a quirky piece of wood that presents unique opportunities to create oddities of form that expose or highlight unusual aspects. For these, I use the catch-all term "vessels." Vessels deviate from the turnings in other categories on this website, for the form of the vessel is more elongated than a bowl, less convex at the top than hollow forms, without the lid of a lidded box, and often precariously supported by a smaller base.
As you can see below, some have bark at the rim. Many are centered on the pith of the trunk or limb, so as to display the entire dramatic array of colors in certain species of wood from interior to exterior, even to the moss living on the bark. Also featured, as dark dots or streaks of color on the sides of the vessel, are cross-sections of branches that had growth from the limb or trunk, as in the first vessel shown below.
Click on the images to see them in detail (including species of wood and dimensions of the piece).