The Asterion II is awesomeness in play versatility for tweens and teens: Endless climbing, spinning, balancing, rocking and swaying. This all takes place in a transparent universe that allows for play with peers through, over, in and out of the structure. It is accessible from ground level for all abilities to be part of play. The Musca Spinner whirls when children use their upper body muscles pushing and pulling it into motion. The spinning movement trains the sense of balance. This is particularly important to teenagers due to their growth spurt. The many responsive climbing activities train cross-coordination. They also provide great seating points for teenagers to meet, taking a break. These points are popular with teens and encourage important social-emotional skills such as the feeling of belonging.