Group of man holding hands icon . vector illustration . team with success standing on the top of mountain, . vector drawing crowds of spectators, holding hands, silhouette people holding hands stock photos, . vector drawing crowds of spectators, holding hands . hands up. man on top of mountain. Flags parade stock photos and images. . # silhouette of two gay men walking holding hands and rainbow.. . # drawing large crowds to flag In recent years, several models for the movement of crowds have been proposed. one can distinguish between two general approaches microscopic and macroscopic models.