 Finally, one could relativize the concept of a compound to a time: enmattered objects are absolutely identical to compounds, but a compound is not absolutely a compound of matter and form, but only relative to a particular time. \(X = F_t(m)\), where m is the proximate matter of X at t; or, combining this idea with the previous one, \(X = F_t(m_1\ldots m_n)\), where t is the period of time for which X exists, and \(m_1\ldots m_n\) are its matters in order of occurrence. This solution does deal with the problem directly, since Socrates and Callias can have the same form and matter, and yet be different compounds because the times are different. There may also be a modal version of the puzzle: Socrates is such that his matter and form could be identical with those of Callias at a certain time. This puzzle might be solved by also relativizing compounds to worlds.