Education, Teaching Aid and Training Content Design Gaenyeomsuda Textbook by Mirae-N Design Team Gaenyeomsuda is a mathematics textbook designed for teenage students. The name is a shortened form of a phrase meaning that concepts are everything in mathematics. The logo uses a speech balloon motif and a hand-drawn style, reflecting the abbreviation and customization found in teen culture. The aim is to make the study of mathematics feel like a chat with a friend, so students open the book without unease. The book measures 210 by 260 millimeters. All pages are matte laminated, and the logo and the illustrations are coated with transparent epoxy.