Wood Sculpture

Here's a wood sculpture by Gerhard Mayer. 

When you use wood in carpentry it is for a practical purpose, like making a table or a seat or even a spoon - an object that makes life easier. But sometimes you can use wood to create art like this sculpture below. You might not be able to do anything with it, but it can enhance a feel of a room and people can take pleasure (via talking about it or via thoughtful contemplation) from this unusual wooden design.

We'd like to know how long it took Gerhard to make it and what tooling did he use? How many saw blades does it take to make such a gigantic sculpture?