But these tasks are difficult for the recent history of the form, since our perceptions are clouded by the haze of historical proximity.

Pounding with a toy hammer or banging on a toy drum, punching a pillow, pounding on play clay, running around outdoors, and swinging on a swing can also help him get his ya-yas out.

Poculiforms Known since the nineteenth century, poculiform snowdrops derive their name from the Latin poculus ('little cup'), and were named by the Revd. Henry Harpur-Crew (1828–1883). The inner segments are elongated so that all six flower segments are generally equal in length, forming a rounded, bowl-shaped flower.

Modern tennis racquets are made of graphite, fibreglass and other man-made materials.