🪟Two Doors Into Digital Worlds
🌍REAL
What you seeJust the real world — nothing digital added yet
🏠 your actual room
📱AR
What you seeReal world + digital things layered on top (an overlay)
📱 dino on your desk
🥽VR
What you seeA whole new digital world that replaces the real one
🌋 inside a volcano
🔑 The big difference
AR = ADDS digital on top — you still see your real room 📱
VR = REPLACES the real world with a digital one 🥽
🎯How Does It Know Where You Are?
🛠️Way More Than Games
🩺DOCTORS
How they use itRehearse surgery in a safe VR simulation first
🧪 practice, no real risk
🏗️BUILDERS
How they use itWalk through a digital twin before a brick is laid
🚪 move a window early
🔧MECHANICS
How they use itAR overlay shows exactly which part to fix next
🛬 also planes & turbines
🔑Key Terms
🌐Spatial computing Tech that lets a computer sense the 3D space around you so digital and real can mix.
📱Augmented reality (AR) Adds digital images on top of the real world you can still see.
🥽Virtual reality (VR) Replaces what you see with a fully digital world you look around inside.
🎯Tracking How a device keeps figuring out where your head and hands are.
📡Sensor A tiny part that detects movement, light, or distance.
🌊Immersion The feeling of really being inside a digital world all around you.
🖼️Overlay A digital image or label placed on top of your real-world view in AR.
🧪Simulation A realistic pretend version of a real situation, built so people can practice safely.
👯Digital twin A detailed digital copy of a real object or place you can study or walk through.
⭐
Remember: spatial computing doesn't erase the real world — it adds new layers of learning, practice, and wonder on top of it. AR adds, VR replaces!