any suitable material such as but not limited to metal steel aluminum titanium plastic polymer acrylic plexi glass glass composite graphite stone wood paper cardboard or any other suitable material each panel generally includes a sufficient thickness to allow basin 10 to stand on a flat or uneven surface in a generally upright position as shown in fig1 when first second and third panels 20 40 60 are joined together a central cavity 12 is formed on the upper side of the panel assembly cavity 12 includes an open concave depression in the center of the assembly cavity 12 is generally shaped to allow one or more objects to be placed in the cavity 12 for example in some embodiments modular basin 10 includes first second and third panels 20 40 60 joined to form a central cavity 12 to be used as a modular fire pit for receiving and burning firewood or some other combustible fuel such as charcoal or wood chips received in cavity 12 in such embodiments a fourth plate 80 may be positioned above the central cavity 12 to provide a grilling or cooking surface as shown in fig1 modular basin 10 generally includes a first.