function love.draw()
    local eyeX = 200
    local eyeY = 200

    local distanceX = love.mouse.getX() - eyeX
    local distanceY = love.mouse.getY() - eyeY
    local distance = math.min(math.sqrt(distanceX^2 + distanceY^2), 30)
    local angle = math.atan2(distanceY, distanceX)

    local pupilX = eyeX + (math.cos(angle) * distance)
    local pupilY = eyeY + (math.sin(angle) * distance)

    love.graphics.setColor(1, 1, 1)
    love.graphics.circle('fill', eyeX, eyeY, 50)

    love.graphics.setColor(0, 0, .4)
    love.graphics.circle('fill', pupilX, pupilY, 15)

    love.graphics.setColor(1, 1, 1)
    love.graphics.print(table.concat({
        'distance x: '..distanceX,
        'distance y: '..distanceY,
        'distance: '..distance,
        'angle: '..angle,
        'cos(angle): '..math.cos(angle),
        'sin(angle): '..math.sin(angle),
    }, '\n'))
end