39] Negative scaling: mirror feature, By Gregory Denby.
I know You all know that but....
When an object is scaled to -1 on any of its axes, via the Transformation requestor, it is mirrored on th at/those axis/axes. This means that one only needs to model a portion of an object that has axial symmetry. If You make the axis the exact center of an object, such as a human face, when You have finished modelling the right side You only have to do a few things to finish the left side. Copy the object, open the Transformation requestor and scale to -1 on the "x" axis. The object will now have been reflected. Paste the original side back in and Join the two parts. Tah Dah!

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