Mirror Y and Z don't work

Basically I just wanted to create legs for a desk, 1 leg should become 4 with mirrors, right?

But only X plane works.

In this sample, the sphere is the centre of the world. No matter where I move the cubes, there are only two.

Maybe move the box a little up and to the side….:wink:
You mirror the box to itself….

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OMG yes, I’m so stupid. :see_no_evil: