Romeo and Juliet

JULIET

How camest thou hither, tell me, and wherefore?
The orchard walls are high and hard to climb,
And the place death, considering who thou art,
If any of my kinsmen find thee here.

ROMEO

With love's light wings did I o'er-perch these walls;
For stony limits cannot hold love out,
And what love can do that dares love attempt;
Therefore thy kinsmen are no let to me.

This Demonstration calculates the stony limits of love.
More specifically, coupled differential equations describe
how love varies over time using a dynamical model.
Time is indicated by color and runs from red to blue.