Technology has revolutionized the way we learn, and the classroom of the 21st century will be no different. With the advent of technology-rich learning tools such as iPads, interactive whiteboards, and virtual-reality headsets, classrooms will become increasingly interactive and engaging. In order to design a 21st-century classroom, it is important to consider the following factors:

1. Multimedia learning: In order to engage students in multimedia learning, it is important to provide them with access to a wide range of learning tools. Multimedia tools such as iPads and other tablets can be used to help students access information, share ideas, and collaborate on projects.
2. Student-centered learning: In order to provide students with a student-centered learning (SCAL) environment, it is important to integrate technology into the classroom. For example, interactive whiteboards and virtual reality headsets can be used to provide students with access to hands-on learning opportunities.

3. Robust learning tools: To ensure that students learn effectively, it is important to provide them with robust learning tools. These tools should be able to accommodate a range of learning styles and be easy to use.
4. Engaging teaching: In order to engage students in the classroom environment, it is important to provide teachers with the necessary tools and resources. For example, interactive whiteboards and virtual reality headsets can be used to help teachers engage students in the classroom environment.
   Overall, the 21st-century classroom is characterized by increased use of technology, student-centered learning, and robust learning tools. By taking these factors into account, it is possible to create an engaging and effective classroom.