How does Caryl Churchill use imagery in Top Girls?

Imagery:

"I put on this dress to kill my mother."

"But I didn’t know what was happening. I thought I was getting fatter, but then I was eating more and sitting about, the life of a Pope is quite luxurious."

I was on the horse dressed in my robes and a cross was carried in front of me, and all the cardinals were following, and all the clergy of Rome, and a huge crowd of people. […] I had felt a slight pain earlier, I thought it was something I’d eaten, and then it came back, and came back more often. I thought when this is over I’ll go to bed. There were still long gaps when I felt perfectly all right and I didn’t want to attract attention to myself and spoil the ceremony. Then I suddenly realized what it must be. I had to last out till I could get home and hide. Then something changed, my breath started to catch, I couldn’t plan things properly any more. […] I just had to get off the horse and sit down for a minute. […] And the baby just slid out on to the road.