Which One is Larger?

Say what you will, but old school stuff never gets old! Just look at this plain and simple optical illusion made from nothing but few lines.

Perspective makes the corridor look 3D, which automatically makes both vertical red lines seem further dissimilar in length. Can you guess which one is bigger? If you’re an old-time viewer, probably both question and correct answer came out to you even before reading this text. Still, let’s see what the newcomers have to say…