Geometry is math with shapes. When learning about 3-dimensional objects, or solids, I find that students can “see” the prism, cylinder, etc. better if they can actually touch it, hold it, and move it around to better understand the relationship between math and the real world. It is extremely difficult to draw a pentagonal prism on a white board, and even more difficult to understand the principals and characteristics of a 3-dimensional object in just a 2-diminsional drawing.