In music, a rondo is a piece with successive segments that go A-B-A-C-A-D…-A, where contrasting segments B, C, D, … are bracketed by repetitions of A that may vary slightly.  Let’s arrange some colorful closeups like a rondo that goes

A-B1-A-C-A-D-A-E-A-B2-A.

– Gray button (upper left corner) reveals widgets, –
– above post (on phone) or beside it (on desktop). –