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Measurement of neutral pions and direct photons are closely connectedexperimentally, on the other hand they probe quite different aspects ofrelativistic heavy ion collisions. In this short review of the $\pi^0$ resultsfrom the PHENIX experiment at RHIC our focus is on the $\phi$-integratednuclear modification factor, its energy and system size dependence, and theimpact of these results on parton energy loss models. We also discuss thecurrent status of high $p_T$ and thermal direct photon measurements both in $p$+ $p$ and Au+Au collisions. Recognizing the advantages of measuring not onlythe "signal", but also all the "references" needed for proper interpretation inthe same experiments (with same or similar systematics) we argue that RHICshould regularly include $d$ + A and even $d$ + $d$ collisions into its systemsize and energy scan.

Pion and photon production in heavy ion collisions