  We introduce a new potential characterization of Osserman algebraic curvature
tensors. An algebraic curvature tensor is Jacobi-orthogonal if
$\mathcal{J}_XY\perp\mathcal{J}_YX$ holds for all $X\perp Y$, where
$\mathcal{J}$ denotes the Jacobi operator. We prove that any Jacobi-orthogonal
tensor is Osserman, while all known Osserman tensors are Jacobi-orthogonal.
