SL Rounds Corners

SL now has "sculpted prims", a prim whose shape is determined by a texture - its "sculpt texture". Sculpted prims can create organic shapes that are not currently possible with Second Life's prim system. Sculpted prims have the same rendering "weight" as a hollow torus prim. Snippets from SLwiki

Historical footnote: Folklore has a short piece on the creation of the first rounded corners for the Macintosh, in 1981.