How do you get the ~real time prototype things shown in the "hands on" section of this page? gemini.g lets you add a canvas or use image gen, but it isn't clea

How do you get the ~real time prototype things shown in the "hands on" section of this page? gemini.g lets you add a canvas or use image gen, but it isn't clear to me how you stick in the "space lift" prompt and out comes what is demo'd