Summary: In the paper modern playpens constructions, which is designed to create a specific skills or abilities in childhood, are analyzed. Established presence and degree of influence of Coriolis acceleration on the formation sided driving ability of upper and lower extremities during the development of children. The construction of playpen, which provides a full and harmonious development of the child, is purposed.

Keywords: playpen, Coriolis acceleration, left-handed, right-hand limbs, Coriolis force of inertia.