Every month I change out the materials and toys based upon the season of the month. Summer I will have sand table and water tables, for winter I will bring snow in and watch it melt, fall with leaves and pumpkin seed, and spring flowers. It is important to keep children interested in learning and provide a variety of different activities for various learning stages. Each activity can be modified for different age groups. If I find that play dough or shaving cream is not age appropriate they will be provided in a separate room from the younger children.
I have never really had any issues with transition unlike a center homes are generally smaller with less rooms to visit. My rooms are all right next to each other and open.