(2) Large Hour Long Hourglasses. The bigger one is filled with white sand, and is bookended by metal bases connected by three rods. The smaller one is filled with yellow sand, and has a slightly twisted lined design, with the words "60 Minutes" on a label on one end. 

Size: 7 x 7 x 12 3/4 in. 

An hourglass (also known as a sandglass, sand timer, or sand clock) is a device used to measure the passage of time. It comprises two glass bulbs connected vertically by a narrow neck that allows a regulated flow of a substance (historically sand) from the upper bulb to the lower one due to gravity. Typically, the upper and lower bulbs are symmetric as they are usually manufactured by pinching a tube. The specific duration of time a given hourglass measures is determined by factors including the quantity and coarseness of the particulate matter and the neck width. Depictions of an hourglass as a symbol of the passage of time are found in art, especially on tombstones or other monuments, from antiquity to the present day, and the origin of the hourglass is unclear, although its predecessor the clepsydra (or water clock) is known to have existed in Babylon and Egypt as early as the 16th Century BC. 

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