This is something like a screen of Karen Plankton, who appears in SpongeBob SquarePants. Click the screen or press space key to generate a waveform (no sound). By clicking or pressing the key again, the waveform disappears.
ver. 2: https://scratch.mit.edu/projects/1255459225 I used "100％ pen sin（サイン）とcos（コサイン）グラフ" attached below as a reference. https://scratch.mit.edu/projects/181760010 2025/12/03 Minor adjustments were made to the waveform's time variation. Credit to Nickelodeon.
