{
  den.aspects = {
    desktop-session-modular = {
      nixos =
        { lib, pkgs, ... }:
        {
          # ----- xfce (x11 + wayland)
          services.xserver.desktopManager.xfce = {
            enable = true;
            noDesktop = true;
            enableXfwm = false;
          };
          services.xserver.desktopManager.xfce.enableWaylandSession = true;
          environment.variables = {
            XDG_CURRENT_DESKTOP = "XFCE";
          };
          programs.xfconf.enable = true;
          programs.thunar = {
            enable = true;
            plugins = [
              pkgs.xfce.thunar-volman
              pkgs.xfce.thunar-vcs-plugin
              pkgs.xfce.thunar-archive-plugin
            ];
          };
          environment.xfce.excludePackages = [
            pkgs.xfce.xfce4-terminal
            pkgs.xfce.parole
          ];
          environment.systemPackages = [
            pkgs.xfce.exo
          ];
          # ----- openbox (x11)
          services.xserver.windowManager.openbox.enable = true;
          # ----- labwc (wayland)
          programs.labwc.enable = true;
          # ----- picom (X11 compositor)
          services.picom = {
            enable = true;
            vSync = true;
            settings = {
              backend = "egl";
            };
          };
        };
      };
    };
}