Always provide a way to get back home...
Quality web design and web site architecture always includes at least a small aspect of search engine optimization (SEO). As you create your web site you will naturally link to pages throughout your site, regardless of how deep or wide it may stretch. As search engines spider and index your site you will gain native and unique keyword finds by the spiders and bots sent.
These natural keyword clusters will assist your site in ranking well for words unique to your site and field of expertise. This means that when a user finds your site through a search engine - they will likely find their way to a page that is not your home page. Being that most visitors will want to see your home page at least once - as well as future search engine spiders, always include a visible link back to your home page, from every web page in your site.