Here is an animation video I created for explaining integration using elementary methods for a high-school in Turkey. Music by Vincent Rubinetti (https://vincerubinetti.bandcamp.com/album/the-music-of-3blue1brown)
integral_example.mp4
This illustrates the example of a non-uniform distribution on a circle. Music: Take Five by Takeshi Inomata
circle_dots.mp4
See the following wikipedia for more examples and explanations.
3D adaptation of the 2D chaos game for a tetrahedron.