“Discrete interior doors” - thé trend for a timeless interior style with a sleek and minimalist design. With its invisible door systems ARLU responds perfectly to this trend. Thanks to these systems, closed doors and walls constitute one whole: the disturbing frames disappear, while the hinges are mounted in such a way that from the outside they are no longer visible. ARLU offers an ‘invisible’ solution for revolving doors, pivoting and sliding-in-the-wall doors.