boxy-headings

The command `boxy-headings' will display all headings in the
current org file as a boxy diagram.  The relationship between
a heading and its parent can be set by using a REL property on the
child heading.  Valid values for REL are:

  - on-top
  - in-front
  - behind
  - above
  - below
  - right
  - left

The tooltip in `boxy-headings' shows the values for each row in
`org-columns' and can be customized the same way as org columns
view.