http://www.tenthdimension.com/medialinks.php
The tenth dimension is an interesting concept that is being put together by author Rob Bryanton.
This video below is an interesting representation of the concept of dimensions. We are in the third dimension. If you follow and believe the concepts presented below, a Data Warehouse would be in the concept of the 4th dimension (time as points). We would be at the 5th dimension (a branch of any possible moment) when we look at the Data Warehouse. You can see how this is difficult to wrap your mind around. Understanding this leads to understanding how complex data warehousing is.