Balloon Universe with Event Horizon
Here is the exact same balloon universe, but this time with an event horizon (a black hole, or the big bang?), which has the effect of cutting off all light from the far side of the universe. Notice that we see fewer galaxies than the previous version. Inside the event horizon the gravity is so strong that light can not escape; the event horizon is like a big black balloon, which even our amazingly wide eyes (the width of the entire universe) can't see through.