Go and open the white door,
maybe, there is a cloud in the sky. Or even fire screeching. Also a tennis ball flying through the blue sky.
Go and open the yellow door,
maybe, there is the sun staring into the moonlit sky. Or the moon lighting it in the night.
Go and open the blue door,
maybe, there will be the blue luxurious sky that lights up the world. Even a beautiful twinkling at your face.
Go and open the green door,
maybe, there is a green light field covering the dirt. Maybe there is green flower leaves ready to leave.