What does this mean?

On the Simpsons episode 'Bart Vs Thanksgiving' Lisa made a centrepiece for Thanksgiving and after she put it on the table Bart came in with the Thankgiving turkey and saw her centerpiece on the table. He said to Lisa 'oh, yikes! What IS that?', Lisa said 'its the centrepiece, Bart' and Bart... show more On the Simpsons episode 'Bart Vs Thanksgiving' Lisa made a centrepiece for Thanksgiving and after she put it on the table Bart came in with the Thankgiving turkey and saw her centerpiece on the table. He said to Lisa 'oh, yikes! What IS that?', Lisa said 'its the centrepiece, Bart' and Bart said 'well it's taking up valuable real estate'. I'm not sure what he meant by this. What did Bart mean by 'taking up valuable real estate'?
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