  One of the open problems in higher category theory is the systematic
construction of the higher dimensional analogues of the Gray tensor product of
2-categories. In this paper we continue the developments of [3] and [2] by
understanding the natural generalisations of Gray's little brother, the funny
tensor product of categories. In fact we exhibit for any higher categorical
structure definable by an n-operad in the sense of Batanin [1], an analogous
tensor product which forms a symmetric monoidal closed structure on the
category of algebras of the operad.
