Doug Engel

Tetrametric
Tetrametric

Disassembly / Metal

Designer: Doug Engel
Maker: Bits and Pieces
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Trinity Infinity
Trinity Infinity

Disassembly / Metal

Designer: Doug Engel
Maker: Bits and Pieces
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Tube Box Puzzle
Tube Box Puzzle

Put-together / Wood

Designer: Doug Engel
Maker: General Symmetrics, Inc (Doug Engel)
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Turnstile
Turnstile

Sequential Movement / Plastic

Designer: Doug Engel
Maker: Binary Arts
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Yin and Yang
Yin and Yang

Interlocking / Metal

Designer: Doug Engel
Maker: Bits and Pieces
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Yin and Yang (Wooden)
Yin and Yang (Wooden)

Interlocking / Wood

Designer: Doug Engel
Maker: multiple manufacturers
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