I animated a couple of GIFs to help us perceive what is happening. The first figure demonstrates how a simple sine signal propagates between buildings. You can observe how the multi-path components sum up to a signal amplifying in some locations and degenerating in others. In the first figure, you can look for Rician conditions (lower right) and Rayleigh conditions (lower left) and see how the signal behaves. The figure was obtained by solving the Helmholtz equation by finite element method.

The second figure shows how the aggregate signal power from many mobile transmitters develops in time under Rician fading conditions. The aggregate power can be considered as interference in a receiver. You can see how the high peaks of interference power emerge at random locations. These kinds of peaks can cause decreased data rates. The figure was obtained by simulating a random walk of points in a realization of the Poisson point process on a plane.

References:

- François Baccelli, Bartlomiej Blaszczyszyn Stochastic Geometry and Wireless Networks, Volume I -Theory
- Nicolae Cindea (2021). Movie to GIF Converter, MATLAB Central File Exchange. Retrieved June 14, 2021.