From concrete gravels unloaded from trucks to wheat seeds discharged through funnels, from polymeric beads filled in shoe cushions to metallic pellets packed in robotic grippers, granular matter is becoming increasingly relevant in coping with our evolvingly sophisticated societal needs in many respects (e.g. expanding urbanization, growing population and advancing manufacturing). This increasing relevance urges developing micro-structural understandings of granular matter regarding its two basic macro-scale behaviors: flowing heterogeneously and morphing adaptively. However, findings in...