diff --git a/scripts/prototype.jl b/scripts/prototype.jl
new file mode 100644
index 0000000..612c35e
--- /dev/null
+++ b/scripts/prototype.jl
@@ -0,0 +1,14 @@
+density_profile(::Val{:one}, x::Real; a::Real)::Float64 = x + a
+
+struct DensityProfile{F <: Function}
+    profile::F
+
+    function DensityProfile(model::Val; pars...)
+        profile(x::Real)::Float64 = density_profile(model, x; pars...)
+        new{typeof(profile)}(profile)
+    end
+end
+
+function (den::DensityProfile{F} where {F <: Function})(x::Real)
+    den.profile(x)::Float64
+end