It is a hypothesis that can be defined as a tantative explanation of the hourglass notion of research
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An hourglass was used as a timer, with the size of the hourglass determining the length of time it measured.
sand + glass = hourglass
glass+sand=hourglass
the hourglass and a cog :)
If by "glass" you mean the hourglass from Phantom Hourglass, you can't draw an actual hourglass, you need to draw an Arabic numeral eight. (like this: 8) If you draw the figure with one circle on top of a smaller circle, it won't work.