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* Manufactured by Darling Model Kits, this custom kit was designed by T.W.Graham Solomons.* The kit consists of Darling's basic Molecular Vision kit with a few additional pieces, so that p orbitals could be shown in molecules like acetylene.* This customized kit also has pieces that allow linear geometry for the sigma bonds of alkynes while also having orthogonal connections at each atom for the associated p orbitals.* By attaching balls of the right colors it is possible to show the lobes of the p orbitals that make up the pi bonds in an alkyne.* Ball colors can be matched symmetrically to show in-phase orbital overlap, or antisymmetrically to show an antibonding state.* Use of colored balls with the appropriate framework geometry is a very nice feature of the Darling model set.* Pieces from Darling's inorganic model set and are used for octahedral geometry.