How to plot the orientation of particles?

Specific Domains Visualization
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It is also common to plot the orientation not with arrows (that can get messy quickly), but instead color the particles in different colors, according to their orientation, e.g. in this paper
https://www.researchgate.net/figure/Simulation-snapshot-of-active-Brownian-particles-in-an-elongated-box-employing-periodic_fig1_337966798

Here is another thread discussing how to achieve that: How to color points in scatter plot by value?

It boils down to something like

julia> using Plots
julia> N = 100
julia> xs = rand(N); ys = rand(N); φs = 2π .* rand(N);
julia> scatter(xs, ys, marker_z=φs, color=:rainbow)