Hi Gandalf. Are there many Hobbits into web design? 
Index page...quite slow loading. It's because your graphics, though beautiful, are huge in file size. You need to check into optimizing/compressing them. Also, I assume there are words between those blue vertical lines? I get the little link hand, but no words appear. (I'm now seeing these problems on other pages, too.)
If you are concerned about search engine placement, the splash page could hurt. They will be looking for text.
uh...I'm totally lost. What is this sponge business? ...and the cubes? (Sheesh...the music is driving me bananas.) What is this thing made of? And what is its purpose? I assume this is a hobby/fun activity...but I know nothing about it. Some explanation would be nice.
It would be good to have a way to get back and forth between the Mengermania portion of the site and the Fractal portion.
BTW...the artwork is great!!!
Best wishes,
Sandy
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www.alleghenyweb.com