So I was going to start writing about what I'd been thinking 2 days ago, thought I'd give it a day or two to collimate my thoughts and ideas for coherency. 

For starters, I've got a new name idea: TwySize. It sounds a bit like "twice" and the w has that smol, uwu vibe. It's also got a similar sound to #Tetent TimerSpy [gd0136] and #T^2 TyMist [gd0138].

Secondly, I think that this will be the new #Tetent TestCut [gd0139]. TestCut is a bit of a dead-end venture that I persued because a futuristic cuboid input device was very intriguing. As a product design project, to see if aesthetics and ergonomics could coexist, it was very insightful and I'm grateful for the knowledge gained. However, I knew that there were more in-the-real-world situations where the ergonomics would falter. Most of that would probably be solved by an actual tenting system that changed the tilt of the device and perhaps a suction cup mount for the work surface, but I never wanted an input device that was landlocked to a table and I knew going in that I wasn't going to iterate on the design after acheiving MVP status because I've had my fair share of keyboards and requiring a surface is Team Annoying TM.

A wired version of this project would allow for much more freedom when in use, whilst still being as simple to implement as TestCut. I can then confidently improve the design with BT connectivity and a phone mount (similar to phone gaming controllers).The other style of gaming controller (like the PSP) is incompatible with the ergonomics required by #Tetrinsic [gd0041]. Essentially, the screen would be facing the user's belly and not their eyes, because those fingers are used for data entry and not holding the device up. Holding the device is mainly the job of the palms.

I tried different household objects and it seems like an A5 journal book is a good length for the device. While 200-210mm is kind of long, it's not that much longer than phones these days. 

It also seems that a slope (see image below) is more ergonomic than sliding on the flat side, and an inverted slope fails.

Due to the requirement of easy pocketability, it does mean that the ball-chain / screen side of the Tetrinsics will be on the outside. I don't think it's too bad of an idea since it would have an even higher cool factor than the white-only Nothing Phone 1 or RGB-Rainbow Unihertz Luna (image below).