A solid model having length adjustable pipes and connecting blocks comprising multiple connecting members and soft connecting body is provided to allow various transformation of connecting angle of connecting members, to allow expression of polygonal solid model, and to allow formation of length adjustable solid model through length adjustable pipes. The solid model for forming various three dimensional shapes by modification of connecting angles of its connecting body comprises: connecting blocks(1) having multiple connecting members(12) and soft connecting body(11) and length adjustable pipes(2) having central piercing hole for combining with the connecting members(12).
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