Why does this computed property returns .white and .black?

I'm completely new to Swift and SwiftUI and I'm following the official apple tutorial (I'm specifically in this section right now: https://developer.apple.com/tutorials/app-dev-training/creating-a-card-view). But, I do not understand this syntax:

import SwiftUI

enum Theme: String {
    case bubblegum
    case buttercup
    case indigo
    case lavender
    case magenta
    case navy
    case orange
    case oxblood
    case periwinkle
    case poppy
    case purple
    case seafoam
    case sky
    case tan
    case teal
    case yellow

    var accentColor: Color {
        switch self {
        case .bubblegum, .buttercup, .lavender, .orange, .periwinkle, .poppy, .seafoam, .sky, .tan, .teal, .yellow: return .black
        case .indigo, .magenta, .navy, .oxblood, .purple: return .white
        }
    }
    var mainColor: Color {
        Color(rawValue)
    }
}

Specifically the return .white and return .black code. Why are we returning .white and .black?

They look like enum cases or something but the var accentColor says it will return a Color type, so why are we not returning Color()? instead of just .white and .black? is this a SwiftUI specific syntax or something?

[Copied from comments for completeness]

You are actually returning the static properties Color.black and Color.white but because the Color can be inferred from the return type you only need to return the static property and not the whole Class.staticProperty.

This is a very common pattern in Swift & especially SwiftUI.