If it were the size of a Volkswagen, it would be going four times the speed of light. It moves so fast that you can't see anything inside it until it's dead. It can replicate itself in under a minute. Compared to a cell, a computer is slow and stupid. Dog houses and clocks don't scale well by a factor of 100.
Cells do, even by factors of a trillion.
An object is a virtual server. For complex systems, the compiler and development environment need to be in the same language that its supporting. It's the only way to grow code. If you think programming is a small thing, that's why your programs are so large. The Art of the Metaobject Protocol is the best book written in computing in ten years.