Property owners take a variety of measures to discourage skateboarders from using walls as boarding surfaces. Usually, there are little clamps on the leading edge of the wall preventing a smooth run along the wall. A typical plain clamp is shown below. The other pictures are of a much more decorative and friendly-looking maple leaf that landed on the edge of the wall. Seen at World Exchange Plaza in downtown Ottawa.
![a leaf falls …](https://i0.wp.com/www.westsideaction.ca/wp-content/uploads/2010/06/p6051849.jpg?resize=300%2C400&ssl=1)
The university of ottawa has the plain version of these and i always wondered what they were. THANK YOU!
http://westsideaction.blogspot.com/2010/06/sculpture-you-can-use.htmlThis must be "Sculpture to prevent use"
St Francis cathedral uses "through-bolts" on their railings.