Physics disclaimer: in reality, rain falls as almost spherical droplets; but people always imagine the water takes up the shape it has when suspended from something. Cherenkov radiation occurs when particles are travelling through a medium faster than the phase velocity of light. With things getting ahead of themselves, I envisioned ripples forming in the impact surface before the drops could be seen to have arrived.
Other colours, stylings, sizes and orientations are available on request (eg if you want drops into a pool of blood) and you can even ask for a combination of several designs together.
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Wallpaper Coverage Calculator
Based on the dimensions you provide, this calculator will determine the number of custom-length sections of paper you'll need to cover any surface. If the height of your surface varies, input the tallest dimension in order for the pattern to line up correctly.
Enter your dimensions in feet (1 foot is 30.48 cm).