In the Spirit of U2

We went to Phipps Conservatory today to see the Holiday/Winter flower show. As always the flowers were beautiful. Santa Claus was there and they had loads of activities for little ones. (And not so little ones)

But how did U2 become involved in this?

That's easy.

In their desert room there was


A Joshua tree 

Hmm.

And I still haven't found what I'm looking for!