Mimicry, which is the use of patterns on the body surface and body color to distract predators, is observed in a wide range of species, but the details of its formation mechanism remain unclear. I will introduce how mimetic patterns are formed in lepidopteran insects such as swallowtails from an evolutionary perspective.

　Even today, when the Internet is at its peak, people-to-people connections still play an important role in communication in local communities. In this context, we can see a mechanism that is different from that of large-scale networks such as SNS. We will discuss the role of social networks in information sharing in local communities, referring to case studies and simulations of disaster-affected areas.

The electric power distribution network, which is an important social infrastructure, is still growing as a single system including consumers, based on a vast amount of technological accumulation obtained through trial and error since its birth 130 years ago. In this lecture, I would like to introduce mainly the equipment technology for transporting electromagnetic energy, and consider future issues and visions.