What tool do you find the most interesting to date?

I find the pen tool most intriguing of them all. The pen tool can be used to create the starting spark in any image. It alone can also be the used for a complete image if that is intended. The pen tool for me is the breath of life for any image being created. It is way more than a pen, capable of forming out the contours and aerodynamics of a nissan GTR, and the iconic curves of sexy from the womans goddesslike figure. The pen tool gives alomost every design its' shape or figure and hence the meaning.