These collages in "The Every-Day Importance of a Knowledge of Astronomy" and "Unclaimed Ancestors" were mostly made using the old-fashioned Xacto knife and glue method, then scanned and enhanced with Photoshop (although a handful of each are purely digital).
The 3D Collages were made by scanning the separate elements to manipulate digitally, then printing, cutting out & gluing them together.
Hand-cut and Digital Collages are just as described.
Most are available as archival-quality 8" x 10" (or larger by request) prints and 5" x 7" greeting cards. Please contact me for details.