I share an office with my husband.
This is the primary reason that we are whimsically eyeing house listings even though moving is presently just a fantasy (trying to get bathroom time between the “needs” of two teenage daughters may be a close second but I could always put a port-a-potty in the backyard). In the meantime I buy storage containers in an effort to somehow condense my beads, yarn, fabric, sewing supplies, clay, fiber, glue, pencils, markers, scrapbooking supplies, paints, papers, books, kits, artwork in progress, and dozens of other random items into half of an 8 by 11 foot space.
Also the family computer has somehow gotten qualified as part of his space, even though he never uses it. Sorry dear.