A plot of Weierstrass's monster with a=1/3 and b=21, over the range -2 < x < 2. The "curve" is blood red on a stark white background. It appears to be shaped like a sine wave, with additional levels of sine wave superimposed.
https://files.mastodon.social/media_attachments/files/111/329/882/848/192/206/original/7f30d27ada291ff0.jpeg