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Description
A fourth version rrawn by Bill Nims. This time some distressing has been added (dings and scratches in the metal). Proportions are better but still require improvement. It's difficult to get right because the cog is an impossible object - an optical illusion - it cannot exist in the 3-D world.

Description
A fourth version rrawn by Bill Nims. This time some distressing has been added (dings and scratches in the metal). Proportions are better but still require improvement. It's difficult to get right because the cog is an impossible object - an optical illusion - it cannot exist in the 3-D world.