This was my favorite piece in the entire garden. I walked by a doorway size opening and said "whoa". Therein was an open space with the six white trees (birch?) set in a square area sided by white mesh screen partitions on three sides with the blue backdrop to the rear. It must of looked really sharp when new and the gravel was snow white and pristine. I only just noticed the three balls while doing this post. Whatever the artist's intent was with this, it worked for me.