in this view nodes are shown as small rectanglesdata items are not shown nodes that exist and are visible in the zoomed-in view (which you can restore by clicking zoom againare shown in green nodes that exist but aren' currently visible in the zoomed-out view are shown in magentaand nodes that don' exist are shown in gray these colors are hard to distinguish on the figureyou'll need to view the applet on your color monitor to make sense of the display using the zoom button to toggle back and forth between the zoomed-out and zoomed-in views allows you to see both the big picture and the details andwe hopeput the two together in your mind viewing different nodes in the zoomed-in view you can always see all the nodes in the top two rowsthere' only onethe rootin the top rowand only four in the second row below the second row things get more complicated because there are too many nodes to fit on the screen on the third row on the fourth howeveryou can see any node you want by clicking on its parentor sometimes its grandparent and then its parent blue triangle at the bottom of node shows where child is connected to node if node' children are currently visiblethe lines to the children can be seen running from the blue triangles to them if the children aren' currently visiblethere are no linesbut the blue triangles indicate that the node nevertheless has children if you click on the parent nodeits childrenand the lines to themwill appear by clicking the appropriate nodesyou can navigate all over the tree for convenienceall the nodes are numberedstarting with at the root and continuing up to for the node on the far right of the bottom row the numbers are displayed to the upper right of each nodeas shown in figure nodes are numbered whether they exist or notso the numbers on existing nodes probably won' be contiguous figure shows small tree with four nodes in the third row the user has clicked on node so its two childrennumbered and are visible if the user clicks on node its childrennumbered and will appearas shown in figure these figures show how to switch among different nodes in the third row by clicking nodes in the second row to switch nodes in the fourth rowyou'll need to click first on grandparent in the second row and then on parent in the third row during searches and insertions with the find and ins buttonsthe view will change automatically to show the node currently being pointed to by the red arrow