The desk it sits on. The surface is actually drawer rails, and slides to center either the keyboard or tablet, depending on what she's doing.
This is my wife's illustration PC (https://lauradiehl.art) and the third PC I've made for her. As this was built during her 20th year doing digital illustration, I went a bit further than usual and blinged it up in her color, which is a slightly more violet blue.
This system is built around a 1st gen Threadripper 1900x, a NVidia Quadro P4000 workstation GPU, and 64GB of RAM, with slots free to expand to 128GB when needed.
Peripherals are a Wacom Intuios4 XL, Microsoft Nautral Ergonomic 4000, and a Logitech G13 gamepad.