Note that some features of the learning objects need to be ‘‘felt” rather than ‘‘observed”. For example, to identify whether the leaf surface of a plant is ‘‘smooth” or ‘‘coarse”, the students need to feel the leaf. For such features, it might be difficult for the students to have
exactly the same ‘‘feeling” as the teacher does; therefore, some supplemental materials that show the detailed information of the features. For example, while guiding the students to ‘‘feel” different coarse levels of the leaf surface, relevant micrographs will be given. With the help of those micrographs, the students will be able to better recognize the actual features of leaf surface while touching and feeling the
leaves.