So 70 years on, there's been some research where cognitive psychologists have actually sussed out the extent to which, you know, L, M and B are more associated with shapes that look like this, and P, T and K are perhaps more associated with shapes like this.
于是70年来，通过一些研究， 认知心理学家们已经弄清楚了 这个现象，如你所知的， L, M, B 与这种形状的图形更贴近， 而 P, T, K 则更贴近这个形状。