- Select the basic  tool from the  tab.  
            
- Click-drag the cursor across the surface of the sphere for one short stroke.  
               Your sculpt stroke moves the affected vertices on the model slightly outwards on the model, creating a ridge. 
                NoteYou can press Ctrl + Z to undo a sculpt stroke immediately. 
                   
- Press the Ctrl key and perform another sculpt stroke on the sphere.  
               This time the affected vertices are moved inwards in relation to the polygonal mesh, creating a trough. 
                NoteSelecting the  tool also displays its properties in the  window. You can change the tool  and  in the  window, or use the hotkeys described in the table below. 
                   
            
               
                  
                  
                  
               
               
                  |  Tool Property 
                      |  Keyboard shortcut: 
                      |  Action/Results 
                      | 
               
                  | Size | B + drag | A circle surrounding the cursor changes size depending on the direction you drag, indicating the region of influence of the
                     tool. | 
               
                  | Strength | M + drag | A vertical line above the cursor changes length depending on the direction you drag, indicating the change in tool strength. | 
            
          
         For more information, see Sculpting overview.