Use Red Like A Spice

I ran up on this piece of design while I was wandering around the old town of Zagreb, the capital of Croatia. I've always found street art very charming, it brews some kind of joyful spirit that winding through a city. As you step out of the corner, firstly the wire with clothes catches your eyes then you see the red bike. I believe that this scene attracted lot of attentions and made many smiles.
Although red can easily wash up all the boredom, same as the red bike cheers up grayish street, but I like that color only within details. Both in art and in life. Not enough of red makes everything insipid but also too much of red is tiring... just like a spice.
What's your relation with red?