The aim of this issue of DIID is to describe design as inventor through narrations and illustrations of approaches, experimentation and projects. A useful mapping to re-read the design complexity in order to explore its present boundaries and lay down guidelines for its future developments. Invention pins down a possible solution that the maker uncovers amidst available knowledge. Thinking, inventing and producing: reality - the physical and psychic world - becomes material for continuous investigation and interpretation. Design research 'disrupts to re-arrange', namely, it seeks to achieve original results via re-discussing previously envisaged well-established paradigms and schemes. A penchant for experimentation and contamination allow to define design as inventor: a 'special place' not only for engineering invention, but also for a quest for new forms of behaviour, new material or sensory worlds that can originate radically innovative relationships between men and artefacts.