If you are looking for a hardware feature rather than an architectural one:
The world of hidden zone toilets is evolving rapidly, with new innovations and trends emerging: hidden zone toilet
Installation of these units has also become more homeowner-friendly. While early skirted models were heavy and difficult to bolt to the floor, modern "Easy-Fit" systems use side-access holes or top-down mounting kits. This ensures that the sleek, seamless look isn't ruined by bulky installation hardware. If you are looking for a hardware feature