Stackable block

A stackable block, comprising:

• a wall having an inner surface and an outer surface, the wall comprising a strip of material having a first end and a second end with a plurality of transverse fold lines spaced there between, the first and second ends being configured to be connected together,
• wherein the wall is configured to define a structure having an upper perimeter and a lower perimeter, the structure being formed by the strip being folded about the transverse fold lines,
• wherein at least a portion of the inner surface of the wall is vertically offset from the outer surface of the wall such that at least part of the upper perimeter has a stepped configuration, and at least part of the lower perimeter has a stepped configuration,
• wherein the upper and lower perimeter have complementary stepped configurations such that two or more such blocks can be securely stacked, and
• wherein the vertical offset between the inner surface and the outer surface of the wall at the lower perimeter is equal to the vertical offset between the inner surface and the outer surface of the wall at the upper perimeter, such that when the stackable block is stacked upon a second stackable block, relative movement between the blocks is inhibited-,
• wherein material is removed from the strip to form a plurality of angled cut-outs each having a central vertical axis coinciding with one of the plurality of transverse fold lines, wherein each angled cut-out forms two angled surfaces in the wall, such that the two angled surfaces of each angled cut-out are brought into contact when the strip is folded about each respective fold line.