We are surrounded by and interact with design everyday. These designs are created and subject to math. Skate boarding for example involves the calculation of the mechanical parts of the skateboard. These calculations are done with the typical math that we are all familiar with; numbers, variables and equations. However there is another set of calculations involved in skate boarding that doesn't have a set equation of numbers or variables. This is our natural ability to calculate trajectory without the standard numbers or variables but instead with our sensory. We simply, or complexly, use our sensory perceptions as the variables in our personal equations to calculate how far we will travel and how long we are airborne. Of course everyone’s calculations are different but that’s why sum of us are better at judging trajectory than others.