It all comes down to colour psychology and how brightness, shade, tint, tone and overall colour temperature can alter your experience of a given hue. Warm colours such as red, orange and yellow are especially linked to happiness, optimism and energy, as are bright, light pastels such as peach, soft pink and lilac. Studies show they all release the happy hormone, dopamine. Colour theorists also suggest that blending multiple primary and secondary colours—be it in an outfit, a colour scheme or indeed a painting—will produce a happier outcome, so if you're working with an art buyer, suggest they hunt high and low for works that tick these boxes.
Take the approach of Sasha Bikoff—the New York designer known for her vivacious, maximalist handwriting—who chose to design in the extreme with her addition to the Kips Bay Decorator Show House. Rococo meets Memphis Milano best describes her subversive blend of zig-zags, polka dots and pyramid shapes seen from walkway walls to staircase carpet.