My own contact with one of these devices came about in the following manner:
I had come into Argon City under cover of darkness, which is the only sensible thing to do, in my profession, and I was stealing through the back alleyways as silently as my rusty joints would allow.
I was less than three blocks from Benny’s Place, and still undetected, when I passed the window. It was a large, cheerful oblong of light, so quite naturally I stopped to investigate, being slightly phototropic, by virtue of the selenium grids in my rectifier cells. I went over and looked in, unobtrusively resting my grapples on the outer ledge.
There was a Builder inside such as I had not seen since I came to Phobos half a century ago, and yet I recognized the subspecies at once, for they are common on Earth. It was a she.
It was in the process of removing certain outer sheaths, and I noted that, while quite symmetrical, bilaterally, it was otherwise oddly formed, being disproportionately large and lumpy in the anterior ventral region.
I had watched for some two or three minutes, entirely forgetting my own safety, when then she saw me. Its eyes widened and it snatched up the alarm clock which was, as I have hinted, near at hand.
“Get out of here, you nosey old tin can!” it screamed, and threw the clock, which caromed off my headpiece, damaging one earphone. I ran.
If you still do not see what I mean about racial prejudice, you will, when you hear what happened later.
I continued on until I came to Benny’s Place, entering through the back door. Benny met me there, and quickly shushed me into a side room. His fluorescent eyes were glowing with excitement.
Benny’s real name is BNE-96, and when on Earth he had been only a Servitor, not a General Purpose like myself.