ꇙꉔꋬꋪ꒯ꌦ ꉔꋬ꓄ 🐈‍⬛ on Instagram: "SpongeBob is a sea sponge with a rectangular shape. In The SpongeBob Musical, SpongeBob's exact species of sea sponge is identified: Aplysina fistularis, a yellow sea sponge that is commonly found in open waters.[15] He is designed to resemble a rectangular cleaning sponge; throughout history, cleaning sponges were made from actual sea sponges that had been cut into a rectangular shape. He is light yellow (whose exact shade of yellow is designated by Pantone to be