Help With Photoshop CS5

[Alpha Zeke]

Just curious, is there an easy way to mirror an object to the opposite side of the canvas, so that it is symmetrical with a copy of itself? Say I have a Horizontal rectangle. I Have a red box in the bottom left, moved out a bit so the canvas clips it. I want to mirror it to the top right as a copy, so that the opposite corners look exactly the same. How can I do this if the origin is at the bottom left of the canvas?

[Alone Elf]

Just curious, is there an easy way to mirror an object to the opposite side of the canvas, so that it is symmetrical with a copy of itself? Say I have a Horizontal rectangle. I Have a red box in the bottom left, moved out a bit so the canvas clips it. I want to mirror it to the top right as a copy, so that the opposite corners look exactly the same. How can I do this if the origin is at the bottom left of the canvas?

go to Edit->Transform->Flip Horizontal

[Alpha Zeke]

Not what I am looking for. That simply flips it horizontally over its own center. I need it to mirror over the axis of the center of my workspace, flipping both ways.

[Louis Lux]

Rotate 180º?