Diabolical cube seven and nine pieces respectively. However, writes that the diabolical cube appears to be the oldest puzzle of this type, first appearing in an 1893 book "Puzzles Old and New" by Professor Hoffmann (Angelo Lewis). Because all of the pieces have only a single layer of cubes, their shape is unchanged by a mirror reflection, so a mirror reflection of a solution produces either the same solution or another valid solution. The puzzle has 13 different solutions, if mirrored pairs of solutions are not counted as being distinct from each other. Diabolical cube The diabolical cube is a three-dimensional dissection
Lövheim cube of emotion Lövheim cube of emotion Lövheim cube of emotion is a proposed theoretical model, aiming at explaining the relationship between the monoamine neurotransmitters and the emotions. The model was proposed in a paper of 2012 by Hugo Lövheim. In the model, the three monoamine neurotransmitters serotonin, dopamine and noradrenaline form the axes of a coordinate system, and the eight basic emotions, labeled according to the affect theory of Silvan Tomkins, are placed in the eight corners. The origin corresponds to a situation where all three signal substance are low. The eight corners of the cube correspond to the eight possible combinations