## 3 State of the Art in Augmented Reality Children's Books  
Numerous apps have been developed that utilise augmented reality techniques in conjunction with a book, mainly presenting relevant instructional information to the visitor. The motivation for using such strategies is that cultural heritage apps must offer a large quantity of data, which must be filtered to make it easily accessible to the particular user. More precisely, the Live Solar System (LSS) is an augmented reality (AR) instructional application designed to assist students in learning about astronomy. As a result, LSS incorporates a variety of multimedia components such as video, images, text, and 3D objects to accomplish its objective. It is implemented by capturing the actual world image using a webcam and then sending it to the marker detection procedure. After the marker's ID is identified, associated digital items such as 3D objects will be loaded. The collected real-world vision will then be mixed with digital material and sent to users via HMD or display. The cube was utilised as the input device in LSS. LSS enables students to freely explore the AR solar system to understand the solar system's eight planets better. Additionally, kids may learn about the planets' properties, such as their suns, and their phenomena, by combining physical and digital learning resources [54]. Additionally, the augmented reality mobile technology [11] can guide student visits through interactive texts, photos, and audio information to learn about cultural heritage. The virtual multimedia information enables users to explore and obtain route/landmark/ survey knowledge for the adjacent heritage sites' geographic space. [PERSON] et al. revealedthat as compared to voice instruction, augmented reality guidance enhanced visitors' feeling of the location more effectively. [PERSON] [55] conceptualised and created an interactive spatial augmented reality (iSAR) book on Myanmar's cultural heritage. This iSAR book contains 18 pages of rich media material, including films, animations, sounds, and photographs highlighting Myanmar's cultural legacy in a digital format. Along with virtual content, Leap Motion provided navigational elements such as virtual buttons and touch-based hand gestures. As a result, the produced iSAR book enabled the seamless integration of virtual material and navigational functions into a physical book. Five participants were chosen to review the prototype iSAR book, and interviews were performed to elicit their opinions regarding the book's immersive aspects. Thus, the produced iSAR book on Myanmar efficiently communicates the nation's cultural history, allowing users to explore and better understand the country. [PERSON] [56] intends to incorporate augmented reality (AR) technology into story-telling to enrich and motivate children's reading experiences. The primary purpose of this project was to create GoonAR, a multilingual augmented reality children's storybook smartphone application. GoonAR is a smartphone application for Android that uses augmented reality technology to depict 3D characters and locations in the tale. The software provides an enjoyable learning experience for auditory, kinaesthetic, and visual learners while immersing them in educational activities. A unique story was constructed, as well as a pseudo-book. The pseudo-book makes use of augmented reality technologies to display 3D assets. Grade 1 pupils under the age of 6-7 years old are the intended users of this programme, as this is the age at which children begin to learn to read. The users may comprehend the tale in two ways: (1) with the assistance of a narrator who speaks both English and Filipino, or (2) by reading it on their phone and watching displayed 3D objects made possible by the usage of Unity and the Vuforia framework. [PERSON] [57] utilises both the story and the three-dimensional, tactile qualities of pop-up books to engage audiences with digital material via augmented reality.