Move setup and draw to separate namespaces.
Add color schemes to separate namespace.
Map colors to depth range directly.
Make the activation color a little greyer.
Set up color steps as fractions of depth range.
Parameterize color scheme function.
Setup range for second layer (bing). Prep for adding first layer, large cols.
Draw long columns for 2nd layer.  Move sound bing to separate ns.
Add depth separation between 1st layer and 2nd layer (long columns).
Add sound to second layer... need to add pattern.
Comment out the rhythm section for now.
Add timer to drums on long cols (2nd layer) to delay playback.
Add sizing from museum visit #2.
Remove commented line.