Back in 2003 PCs were changing.
We’d suffered the horrible beige boxes of the 90s and with the invention of the iMac in 1998, companies were looking to make their machines more aesthetically pleasing.
PCs weren’t just tools anymore, they were art pieces, and Shuttle wanted in on the market.
They released and refined this cuboid form factor using the sort-of-but-not-quite flex-atx standard for the motherboard, and off the shelf components for everything else.
It sort of worked, though eventually Shuttle would fall into obscurity once other mainstream providers jumped on the bandwagon and started to offer small form factor designs.
Still, I had one, in 2003, and now I have one again: