(57) A block for use in construction, particularly though not exclusively paving, has
top and bottom surfaces one of which is a rectangle and the other of which is a square
or a rectangle. In the case where the other surface is a rectangle the block has the
major axes of the rectangles mutually perpendicular and has a shape at mid-height
in horizontal cross-section which is substantially a square and the length of the
side of said square is within the range 66% to 300% of the height of the block. In
the case where the other surface is a square, the major axis of the rectangle is greater
in length than the side of the square and the said square has a side of length within
the range 66% to 300% of the height of the block.
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