The text discusses the resurrection of an old PubNub project called StackHack, a collaborative WebGL application designed to create an engaging 3D environment by combining various technologies, including WebGL and PubNub Data Streams. It highlights the use of WebGL for dynamic visualizations and raycasting techniques in three.js to translate user interactions from a 2D to a 3D environment. The application enables multiple users to interact in real-time by utilizing the PubNub Data Streams to publish and subscribe to changes, thereby facilitating a seamless collaborative experience without the need for complex server setups or load balancing. This approach simplifies the development of multi-user applications, allowing for a scalable and interactive platform where users can collaboratively build and modify a 3D world.