Chimney silhouette about 1 year 2 Chimney silhouette about 1 year 2 Chimney silhouette about 1 year 1 Factory silhouette about 1 year 0 Factory silhouette about 1 year 2 Factory silhouette about 1 year 2 Factory silhouette about 1 year 1 Cloud silhouette about 1 year 9 Steam locomotive silhouette about 1 year 7 Fire Extinguisher silhouette almost 4 years 12