How can something imagined become a reality?

In the practice of imagination – how is it possible that something that exists only in our imagination becomes a reality? Everything starts in imagination. For example ‘house’ or ‘Temple’ – how is it first created? It starts in a person’s imagination. The mind makes a plan and the body carries out the plan. We need to contemplate this because it is very profound. All inner development is similar. For example, your ability to love, to develop bodhicitta, starts in the imagination.