Why Do Shapes Appear to Bend When You Look at Them on a Curved Surface?

Imagine you're drawing on a balloon. When the balloon is flat, your lines are straight, but when you blow it up and stretch it out, those same lines seem to curve. That’s like how shapes appear to bend on curved surfaces. It all has to do with how we see things from different angles. Our brain takes a 3D world and tries to turn it into something flat that we can understand, but sometimes that makes straight lines look wiggly or bent.