When I saw the theme vertical, towers were the first thing that came to my mind.
A different view of the Torre Guinigi in Lucca.
Can you spot the tower hiding behind the vertical bamboo? (also taken in Lucca)
Here's that tower, one of many in Lucca in addition to the two you can climb.
And for something different...
Vertical red sticks - They were from the 2006 Torino Winter Olympics (not sure of the significance). I saw these sticks all around the city.