Child has his own notion about the order
An ideal order in the house can be harmful for the child, but it does not mean, that there should be chaos. Stereotypes, which are actively formed in a brain of the child, make him or her very sensitive to colors, forms, location in space.
Children perceive objects not separately, but in interrelation with each other. That in its turn promotes their development, therefore to us, adults, it is necessary to avoid drastic changes which can break child’s notion about stability and the order in the world.
Sometimes the kid starts to cry without rhyme or reason, loses appetite, and has high temperature. These symptoms can be reaction to changes of environment which the adult can not notice. In other words, any changes break child’s notion about the order. If these changes are unpleasant to the kid, he or she, naturally, reacts correspondingly.