( ( Of course ) ( , ( ( while ( we ( can ( see ( in ( three dimensions ) ) ) ) ) ) ( , ( we ( ( can ( ( draw ( in ( only ( two dimensions ) ) ) ) ( on ( the ( computer screen ) ) ) ) ) . ) ) ) ) ) )
(ROOT (S (PP (IN Of) (NP (NN course))) (, ,) (SBAR (IN while) (S (NP (PRP we)) (VP (MD can) (VP (VB see) (PP (IN in) (NP (CD three) (NNS dimensions))))))) (, ,) (NP (PRP we)) (VP (MD can) (VP (VB draw) (PP (IN in) (NP (RB only) (CD two) (NNS dimensions))) (PP (IN on) (NP (DT the) (NN computer) (NN screen))))) (. .)))
Of course, while we can see in three dimensions, we can draw in only two dimensions on the computer screen.
(ROOT (S (NP (NNS Humans)) (VP (MD can) (VP (VB see) (PP (IN in) (NP (CD three) (NNS dimensions))))) (. .)))