... a sunburst mirror!
I hemmed and hawed for months about how to attach the keys and finally just tried to glue (wood glue) them. And ... it didn't work so well, so I ended up just nailing them straight through with 1-1/4" nails. I may go back and add a third nail to each key, but I was finished for the day and wanted to see how it would look.
(and did you know? each piano key is numbered ... I used numbers 1-22 on this one)