Hey you, with your ear against the wall,
Waiting for someone to call out,
Would you touch me?
Hey you, would you help me to carry the stone?
Open your heart, I'm coming home.
But it was only fantasy.
The wall was too high,
As you can see.
No matter how he tried,
He could not break free.
The speaker is isolated. He is calling out to someone, anyone who will listen. He simply needs to be touched because he is lonely, and desires human contact.
To me, the "ear against the wall" is so true to reality. In my own experience, I lived next to a family where a domestic abuse problem was an on going affair. There were many nights where i was woken up by the sounds of the couple fighting; the yelling, screaming, slamming, & stereo blaring to try and camoflage the other noises. I called the apartment manager several times about these fights. I was the only one who ever calles. No one else in the building seemed to hear, care or want to get involved.
I think that's what the speaker in the poem (song) is trying to say. We builds these "walls to high", especially in the city where we live so close to one another, but try to stay emotionally far apart. Instead of building these "walls" to protect ourselves, Pink Floyd wants us to start breaking these barriers (walls) down, and start getting to know and care for each other because "Together we stand, divided we fall", or there truely will be no hop at all.