Fat Pencil Studio provides compelling spatial visualizations for lawyers and public agencies. For this case, their client needed to visualize the complex movements of several people, as recorded by their phone calls and texts, using cel tower data subpoened from the phone companies. Such data are constrained in unusual ways. The actual content of the calls or texts isn’t recorded, and neither is the real location of the phone. But the cel company records what tower what pinged, at what time, what number was connected, and some other information about the connection. Scrubjay helped Fat Pencil Studio produce a Django + MapBox + D3 web mashup that they could use to explore those movements. An anonymized and simplified demo of the software we built is available at arbutus.scrubjay.works. Click on a map dot to see its corresponding record on the table. Highlight a section in the timeline to see only the calls in that time slice. Longer calls have longer bars. Click the checkbox to highlight only specific calls. Note: this demonstration site uses anonymized data.