Figure 2. (IMAGE) Osaka University Caption We experiment several internal structures to estimate the optimal solution for the structure that does not change the appearance of the cookie, but still allows the data to be read. Credit 2022 Miyatake et al., ACM UIST 2022 Usage Restrictions Credit must be given to the creator. No derivatives or adaptations of the work are permitted. License CC BY-ND Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.