I think your answer is going to be....A-show rememberance and memory of a specific event? I’m sorry if I’m wrong
        
                    
             
        
        
        
graphite. the center of a pencil is generally graphite 
 
        
                    
             
        
        
        
A model is a three-dimensional of a person/thing or of a proposed structure.
A mock up is a model or replica of a machine or structure, used for instructional or experimental purposes.
A prototype is a first or preliminary version of a device or vehicle from which other forms are developed.