We should use our creativity and imagination and our senses to cultivate compassion and extend it to all sentient beings. We should try and free our compassion so that it can travel beyond our own bodies and seep throughout the environment. If we use our imagination in this way then our compassion can help beings.
For example, when the wind blows we can imagine that our compassion is spreading throughout space to benefit beings and enter their hearts. We can also imagine that our compassion is flowing out on the clouds towards sentient beings ~ 17th Karmapa