Change of photon energy and wavelength in the visible regime

Cartoon of lattice vibrations

Cartoons of a vibrating diatomic molecule

Cartoon of circular flight around a cemetery as an analogy of crystal planes

Cartoon of a rotating/flipping spin

Cartoon of sphere made of cubic elements with increasing resolution

Cartoon of cross-section through the Earth 

Si(111) 7x7 reconstruction

Cartoon of magnon waves

Fourier transforms explained graphically

Adding waves

Fourier-series examples

Discrete Fourier transforms with examples