At this stage in the design process, I find it most helpful to produce lots of variations on a theme, exploring the strengths of a direction while also discovering its weaknesses.
Initial explorations
The first round of designs stuck close to the PM's initial wireframes. I didn't find them to be terribly promising. Not only were the data visualizations too complex to be useful, but also having separate charts for days of the week and house of the day was hiding salient information.
If you only see the average of nighttime clicks, you will miss that they’re happening primarily on the weekends. Similarly, if you see only the average clicks per day of the week, you won’t know that users are most active during afternoons at work and mid-morning on weekends. What we needed was a visualization that could capture and communicate these nuances.