Image of a single transgenically labelled neuron surrounded by several labelled astrocytes. Each structure is color-coded by relative depth (blue is deepest, red most superficial). Note the cloud-like nature of astrocytic structures. Image credit: Iaroslav Savtchouk and Andrea Volterra. Additional technical details: Original data (unpublished) obtained using 3D two-photon imaging in acute cortical brain slices of adult mice, 3D stack data size 335 × 313 × 70 um (x, y, z; lateral resolution 0.541 um/voxel, axial 1.0 um/voxel).