Everone was trying to "hammer him into shape".
Plus two hammers in a cross resembles the swastika.
"Nobody is free, even the birds are chained to the sky" - Bob Dylan
Basically what the other poster said. Everybody in Pink's life was trying to hammer him into something he wasn't. The Teacher was trying to hammer him into a proper, non-creative student. The Mother was trying to hammer him into a perpetual child who would always stay by her side even after he grew up. And the Wife...well, I guess she was trying to hammer him into a husband who actually loved and cared for her like she did for him. But we all know how that turned out.
1-800-TRUTH
http://rebelwithanilldefinedcause.blogspot.com/
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what tool builds walls? hammers
what tool tears walls down? hammers