Shopping is considered a leisure activity of psychological interest. Shopping engages selection and purchase."Window shopping" is an American/English phrase meaning to seem into glass windows of a shop for amusement and imagine purchasing items without
actually purchasing, possibly just to pass the time among other activities, or planning a purchase.Shops are divided into numerous categories of stores
which sell a selected set of goods or services.Many stores are part of a chain: a number of similar shops with the same name selling the same products in
dissimilar locations. The shops may be owned by one company, or there may be a franchising corporation that has franchising agreements with the shop
owners. Several shops sell second-hand goods. Often the public can also sell goods to such shops. In other cases, particularly in the case of a nonprofit shop, the
public contribute goods to the shop to be sold. In give away shops goods can be in use for free. In Antique shops the public can discover goods that are
older and unique.

Metamorphosis
Metamorphosis is a procedure in biology by which an individual physically expands after birth or hatching, that involves important change in form as well as growth and separation. It usually accompanies a change of habitat or of habits, but may occur without such change. Insects, amphibians and some additional organisms undergo metamorphosis.

Change of habits or habitat
Many insects and amphibians undertake metamorphosis with a important change in habits and habitat. undeveloped dragonflies are aquatic, though the adults are flying insects, and frogs undergo a metamorphosis from an water tadpole to an amphibious adult form. Change of habits is illustrated by the renovation of the free-swimming young of many water invertebrates into sessile adults (eg sea squirts), and the development of butterflies and moths from caterpillars with crushing mouthparts into flying insects with sucking mouthparts.
By compare, many crustacean genus undergo significant physical metamorphosis without altering habits or habitat significantly.
It was once thinking that, in cases where the animal's habitat remains unchanged, metamorphosis tracked a series of forms representing evolutionary ancestors of the species in question (see ontogeny recapitulates phylogeny), but this is no longer thought to be factual.