object properties help

I want an object to perform an action when this hit another object eg. I control a cube, when this one hit another cube the mesh will be replaced. So I set anything fine to make it work (see the picture above) also I added the property to the ‘wall’ CUbe but it does not work . obviously I missed something, but what?

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Hello
you’ve a “ray” sensor, not a “collision” one?!
And the checked object must be an actor too, probably?!
Bye

Ok added a collision sensor and it works, thanks, !