A photo of windows formed the basis of this Liquib Droste
rendering. The window panes in the center were flanked by columns, and
that area was made transparent by using the GIMP graphics program.
The Droste Tool was then applied with the Droste Style set to
Winding Boxes. Another variation appears below.
The Convolvate Droste Style was applied to the same windows photo to
produce this roughly symmetrical image of window frames descending into
oblivion. Where does each level begin and end?