[natch]

10.9cm free standing, no glue or tricks but top two bricks are just resting, not attached.

https://imgur.com/gallery/FEk9l

[jacquesm]

2mm below the tallest, but how earth do you get the pink piece to balance on the gray piece?

I bow to the master.

[natch]

There is a taller one? Do tell! Link?

Edit: and as to how to get the pink one to stay, it was just some delicate balancing. And the pink one is tilted slightly toward the viewer/left, in other words aside from being (obviously) oriented diagonally, it's also not oriented straight up and down in the other axis. Managed to do it a few times for different attempts, as the first time the pip wasn't riding as high as it could be. The pip just stays on (barely) by friction, btw.

[jacquesm]

http://imgur.com/a/FXhbH

That one is 11.1 by my tape measure.

You could put them side-by-side.

Still amazed you got that to balance. I tried it (after seeing your picture) but gave up :)