A TagTool seems to be a sort of physical computing drawing tablet. Sliders and knobs change drawing parameters, and a minicomputer inside does the heavy lifting.
Sam T. built one into a suitcase using a Boarduino!
See the video which he kindly sent to me:
Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.