I turned the large column by the staircase into a tree. I tied a bundle of green balloons to the base of the column. I used brown crepe paper to wrap the column to conceal the balloon strings and give the tree some bark.
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I created a balloon tree with the help of an aerial platform, 25 volunteers and 6000 balloons at Eindhoven Central Station. And another balloon tree.
How To Make Balloon Topiary Trees