It’s yellow

It’s the colour of choice for children when depicting the sun shining in colouring projects, and that of smiley face icons on emails and text messages. It’s also the colour of spring melting into summer, of primroses and pale marigolds, and shades that deepen to gold as summer burns into autumn.
Feng shui gurus would say yellow has energy stimulating properties, making it ideal for dining rooms and kitchens to encourage the flow of conversation and debate, so maybe it’s not the best colour for the bedroom in case such stimulating conversation becomes over-stimulated and ends in a fight.