How do pyramus and thisbe speak to one another?

Pyramus and Thisbe were forbidden by their parents to marry.  They spoke to each other through a crack on the wall.  They arranged to meet at a mulberry tree and Thisbe arrives first.  She sees a lion with blood in its mouth and she flees.  When Pyramus arrives, he discovers Thisbe's veil.  Thinking that she had been killed, Pyramus commits suicide by killing himself with a sword.  Thisbe comes back and discovers, horrified, that Pyramus had died. Thisbe then kills herself with the same sword.  
William Shakespeare recreated this story when he wrote the play Romeo and Juliet.