If your front yard if flat you need 21 stones for each layer your would like to build. A typical retaining wall around a tree would require 3 layers. If your front yard has a grading, you have to see how many stones you need depending of the grading.
How much does it cost? As of 2010, the 4-day passes to Comic Con were $100 each. However, it increased as the years went by. According to WhenNerdsAttack.com, the 4-day pass with preview night costs $175 for adults and $87 for juniors, military and seniors.
The convention logo was designed by Richard Bruning and Josh Beatman in 1995. In September 2010, the convention announced that it would stay in San Diego through 2015. In 2015, working with Lionsgate, a video channel was created to host Comic-Con related content. According to the San Diego Convention and Visitor's Bureau, the convention has an annual regional economic impact of $162.8 million, with a $180 million economic impact in 2011.