GeoGebra visualisation: Parametric vector form of a line

GeoGebra visualisation: Parametric vector form of a plane

YouTube: Tesseract animation

YouTube: 4D Rubik's Cube

GeoGebra visualisation: Projection of a vector on another vector

7 into 28

Counting stick, Ishango bone

Tally stick explanation, and one from Germany

GeoGebra visualisation: Polar form of a complex number

Eulerzimmer

Jia Xian Triangle (a.k.a. Pascal's Triangle)

Pascal's Triangle

Calculus Rhapsody

Google matrix

Engineering applications of linear algebra

Computer graphics, genes, economics

Nine Chapters of the Mathematical Art

Nine Chapters of the Mathematical Art

Augmented matrix from Nine Chapters of the Mathematical Art

Counting rods, and a picture

Best hat