奶牛关为什么选择这个背景色？而不是大家接受度很高的白色系？

这是一个色彩心理学的问题，首先看一下对应的颜色暗示：

红色

Red has more personal associations than any other color. Recognized as a stimulant, red is inherently exciting and the amount of red is directly related to the level of energy perceived. Red draws attention and a keen use of red as an accent can immediately focus attention on a particular element.

与其它颜色相比，红色产生更多的人际交往。作为一种公认的***，红色天生令人血脉贲张，而且红色的剂量会直接影响到能量的爆发程度。红色引人注目，巧妙地将它用作一种强调，可以立即将众人的注意力聚集到某个特定元素上。

黑色

Black is authoritative and powerful; because black can evoke strong emotions, too much can be overwhelming. Black represents a lack of color, the primordial void, emptiness. It is a classic color for clothing, possibly because it makes the wearer appear thinner and more sophisticated.

黑色就是权威和力量，这是因为它能唤引强烈的情绪，大片浓重的黑色简直势不可挡。黑色意味着色彩消逝，以及混沌般的空洞虚无。它是经典的服装用色，可能是因为它令人看起来更加干练。

看见这种配色，你会联想到什么？

1、乔1

2、黑夜中的火，原始宗教的仪式感

3、黑西装，红酒杯，唇印

4、奶牛关