Round and round it goes with a circle as a base and point on the top. We witness this 3D shape in all the parties, some wear it on the top of their heads and some eat it as the base for their scoop of ice-cream. Any Guesses? Manipulatives are an important tool to help students understand 3D shapes. Our Grade 2 students used the 3D shape-Cone to create their own Christmas Party Hat.