Cosmic muons have been used to image large objects from nuclear reactors to pyramids, thanks to their absorption within thick layers, but until now it has not been possible to image small objects. Now, Istvan Bikit of the University of Novi Sad in Serbia and colleagues have used a muon tracker and a high-purity germanium gamma spectrometer to perform the first cosmic-ray muon imaging of small objects made from low-Z elements. The study, which exploits the greater transparency of low-Z elements to secondary particles, represents a major improvement over absorption-only neutron imaging.