This ceramic Tardigrade Night Light looks like a classy piece of science-nerd art during the day, but turn it on at night and it glows a reassuring green color. At 4-1/8" x 2-1/4", it’s many times larger than an actual tardigrade, which means you can see it at night without a microscope. You’ll wish it could make its way over to your ear to whisper tiny lullabies into your ear, “Hush little tardigrade, don’t you cry. Mama’s going to sing you the first one hundred digits of Pi.” 2 LR44 batteries included.