Oasis is a trademarked name for wet floral foam, the spongy phenolic foam used for real flower arranging. It soaks up water like a sponge and acts both as a preservative to prolong the life of the flowers and a support to hold them in place. The foam's structure is similar to that of plants and has capillary action to move water to the surface and up the stem. It is often green, but is also available in many other colours, such as purple, red, yellow, and brown. It usually is supplied in a brick shape, but can be bought in spherical shapes. Oasis can be bought wholesale or in arts and craft and gardening stores, particularly ones that feature large faux flower collections for creating artificial arrangements.