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<td> [[Image:persistent.png|thumb|left|300px480px|Changing CubeCAD's drawing mode from the preferences dialog.]] </td>
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Of the above list, box, pyramid, rectangle strip, ellipse strip and super-quadratic curve (i.e. all but line) have fixed centers by default. This means that when you draw these objects or later edit them, the coordinates of their LCS centers remains fixed. As a result, as you draw the base of a box or a pyramid in the XY plane, or as you draw a rectangle strip, an ellipse strip or a super-quadratic curve in the XY plane, the dimensions of the object expand or shrink in equal amounts along the ±X-axis, and so do they along the ±Y-axis.
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<td> [[Image:lock_base_tn.jpg|thumb|left|480px|Drawing a rectangle strip object with or without a fixed center (locked base).]] </td>
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