Everyone grieves differently. Some retreat inward and deal with tragedy personally, others take their grief and express it outwards.
For Chicago resident Greg Zanis, he shares his grief through memorializing the victims of mass killings, with individual wooden crosses to remember each life that was lost.
He recently traveled to Las Vegas to erect 59 crosses right beside the iconic "Welcome To Fabulous Las Vegas" sign. Each cross has the name of one of the victims written on it because we often just look at the victims as a group or a number instead of human beings.
This isn't the first time he has traveled to deliver this message.