Digitally we work with 2D tools, however we’ve evolved in a real 3D world
As humans we live and interact in a 3D world. Our brains and bodies are so good at working in 3D, that we take it for granted. Simple actions like drinking a cup of coffee we do automatically. But how did you pick up that cup? How did each finger move? how did you transfer the cup from one place to another? How did you know where it was? Where it should go? Our brains process all this information, without us even consciously thinking about it.
Digitally however, we live and work in 2D, which is known as Screen Space. We look at flat monitors, click keyboards, move mice over mats and swipe our phones. We’ve got good with these 2D proxies, but we’ve not evolved over millions of years to use them.