As a slightly more complicated example, suppose O is the owner of Blackacre. Consider what happens when O transfers the property, "to A for life, then to B". Person A acquires possession of Blackacre. Person B does not receive any right to possess Blackacre immediately; however, once person A dies, possession will fall to person B (or his estate, if he died before person A). Person B has a "future" interest in the property. In this example, the event triggering the transfer is person A's death.