The present study examined how a wood-decaying mycelial network responded to two different situations: wood blocks placed in a circle versus cross arrangement. For example, if the fungi didn't display decision-making skills, they would simply spread out from a central point without consideration for the position of the blocks. Remarkably, this is not what the researchers witnessed.
Not my field of expertise, at all... but seems to be peer reviewed. More than just fascinating, the aesthetics are nice too :)