The size and complexity of single-cell datasets can limit their utilization. To enable diverse uses of our atlas, we developed interactive web-based software (DropViz, http://dropviz.org/) that facilitates access and dynamic exploration of the data. We hope that single-cell gene expression profiles, and the patterns present among very many such profiles, can function as a lingua franca for discussing – and functionally dissecting – the cellular diversity of the adult brain.