Someone has managed to build a fully functional and animated Cortana hologram, that can answer your questions and execute some tasks in your home.
YouTuber untitled network, whose real name is Jarem Archer, created a holographic version of the Windows version of Cortana, Microsoft's digital assistant. Essentially, this is what Microsoft's version Alexa or Google Home, if they chose to make Cortana look like her animated counterpart that goes by the same name from the Halo series.
The holograph uses Windows 10's native Cortana program which means that it can not only support knowledge-based queries but also execute home automation commands and music tasks.
The build is powered by a Windows 10 device with 4 GB of RAM, with the help of Unity to create the model. On top of that, the holograph follows your placement – thanks to a front-facing camera.