Abstract: A toy block comprising:sheet material folded to form a toy block having a plurality of planar surfaces.a plurality of holes formed on at least one of the planar surfaces; anda plurality of protrusions removably retained by the folded sheet material and extending outwardly from at least one of the planar surfaces,whereby the protrusions of one block are arranged for selectable and removable interlocking interengagement with the holes of another block.