04/04/2026
Which one of these batteries do you think is bigger?
If you are like most people, you immediately thought the one in the distance. It looks like it could tower over the foreground battery. Your brain is giving you a very clear answer, and it’s based on decades of navigating the real world.
But here is what it is in reality; they are identical. I placed two of the exact same battery on this drawing. This photo hasn't been resized, skewed, or edited.
This is the power of the Ponzo Illusion. I didn't create it with special tools but I created it with simple, manual pencil and biro lines. By drawing perspective cues, a floor of tiles that narrow, a ceiling, and colored walls, I created a depth map that the brain insists is real. Your mind thinks: "If that battery is that big in the distance, it must be huge compared to the small thing in front." It’s an efficient system that helps us see the world, but it’s completely fooled by a few lines on a flat page.
It tells us as a designer that perception is malleable. We can influence how someone experiences a space before they ever step foot in it. What you see is only part of the story but what your brain interprets is the rest.
Try it yourself. Can you physically force your eyes to see these as the same size without looking away, or is your brain simply refusing to allow it?
