Why are there dozens of 6 foot tall penguin sculptures scattered throughout the city? 

It was a local art project to celebrate the Tulsa Zoo's 75th anniversary as well as to raise funds for the Tulsa Zoo's penguin habitat.  Here are just a few examples:

When in Tulsa you'll want to vist the Center of the Universe.  It is a strange place located downtown on the Boston Avenue Pedestrian Bridge between Archer and 1st Street.

If you stand in the center and talk normally, you can here your own echo. It is just plain weird.