ten similar hour glass duplicates set against a yellow backdrop

yellow isolated identical alike duplicate duplicates duplication repeat pattern patterns backdrop background computer generated graphics illustrations two three dimensional dimension jet black bold outline outlines outlined silhouette shape shapes shaped hour glass hourglass sand timer clock sandglass ancient passage time bulbs bulb vertical vertically narrow neck regulate regulated flow gravity gravitational pull symmetric duration measure measurement coarseness particulate matter size sizes width depict depiction monument monuments antiquity eternity granular downward flowing drop dropping