The Xara Trompe L'Oeil Room  Page 3
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Create another duplicate of the large rectangle. With the duplicate rectangle selected, select the Mould Tool, then press the Default Envelope button on the Infobar, it's the first icon with a rectangle.

Click on the top left node with the Mould Tool and drag the control handle down as shown. Do the same thing on the right side, and then the bottom two nodes as shown in the  illustration on the right.

TIP: Hold down the Ctrl key while dragging the control handle to constrain the distance and angle of the handle evenly for all four corners.