Polyhedra plaited with paper strips 
Geometric Solids (Polyhedra) can be constructed by plaiting
folded paper strips without use of glue. Every strip is a sequence of certain quadrilaterals, and every foldingline is an edge or a diagonal of a quadrilateral. The plaiting considered here shall be ruled by a "Plaiting Principle": 

a detailed example  a small exhibition  plaitingscheme analysis 
Ways of plaiting: 1. Every outer quadrilateral of a strip covers one or two sides of the polyhedron ("plain plaiting"). 2. The border of a strip always connects a certain inner point ("midpoint") of a polyhedronside and the midpoint of a certain edge of this side. ("edge plaiting"). 3. The border of a strip always connects a certain inner point ("midpoint") of a polyhedronside and a vertex of this side. ("vertex plaiting"). Tetrahedron, cube, octahedron, and icosahedron, for instance, can be plaited in every way, mixed forms are also possible (see: Cuboctahedron). Requirements for plaiting strips: 1. The plaiting strips of a polyhedron should be congruent to each other, if possible ("congruence property"). 2. Every plaiting strip should generate a "closed sequence of sides" of the polyhedron surface. That means: when plaiting is finished, the first inner quadrilateral i 1 and the last outer quadrilateral of the strip have a certain polyhedron edge in common. ("closedness"). 3. A plaiting strip should, if possible, contain no "vertex quadrilaterals" (except the first inner quadrilateral and the last outer one), that means: no quadrilaterals, with neighbour edges belonging to the border of the strip ("vertex freeness"). 4. the plaiting strips should have the ("maximum property"), that means they should not arise from cutting bigger strips of the same polyhedron into smaller ones (see edge plaiting of the cube e. g.). Of course, these ideal requirements cannot be fulfilled always (the strips for the plain plaiting of the icosahedron, are not congruent, f. i.). 
instruction: pattern printout 
Tetrahedron platonic Solid 4 vertices 6 edges 4 sides 4 equi lateral triangles (4 tr.)  plain 2 strips, mirror images 2 x 2 tr.  pattern download: 1060 x 620 pix, 18 kb: tg.gif or as pdf: tg.pdf  
edge 4 strips 3 x 2/3 tr.  pattern download: 1350 x 780 pix, 98 kb: tt.gif or as pdf: tt.pdf  
vertex 3 strips 4 x 2/3 tr.  pattern download: 2593 x 1761 pix, 705 kb: tk.gif or as pdf: tk.pdf 
Hexahedron (cube) platonic solid 8 vertices 12 edges 6 sides 6 squares (6 sq.)  plain 3 strips 4 sq.  
edge 6 strips 4 x 1/2 sq.  
vertex 4 strips 5 x 1/2 sq. 2 x 1/4 sq. 
pattern download: 2801 x 1745 pix, 114 kb: str4.gif or as pdf: str4.pdf. Easy version: he4.gif or he4.pdf 
Octahedron platonic solid 6 vertices 12 edges 8 sides 8 equi lateral triangles (8 tr.)  plain 2 strips 4 x 2 tr.  pattern download: 2100 x 1000 pix, 36 kb: og.gif or as pdf: og.pdf  
Pseudoglobe [Carlos A. Furuti]  plain 2 strips 4 x 2 tr.  pattern download: 2800 x 1637 pix, 510 kb: oer.gif or as pdf: oer.pdf  
edge 6 strips 4 x 2/3 tr. 
pattern download: 1500 x 1040 pix, 60 kb: ok.gif or as pdf: ok.pdf  
vertex 4 strips 6 x 2/3 tr. 
pattern download: 1620 x 1160 pix, 54 kb: oe.gif or as pdf: oe.pdf 
Dodeca hedron platonic solid 20 vertices 30 edges 12 sides 12 regular pentagons (12 pe.)  plaiting instructions  vertex 6 strips 10 x 2/5 pe. 
a detailed guide to the vertexplaiting of the dodecahedron is also given here (in German language). pattern download: 2340 x 1370 pix, 74 kb: de.gif or as pdf: de.pdf 
egde 12 strips 5 x 2/5 pe. 
pattern download: 2655 x 1971 pix, 88 kb: dk2.gif or as pdf: dk2.pdf  
vertex 6 strips 10 x 2/5 pe.  pattern download: 3249 x 2750 pix, 233 kB: dv.gif or as pdf: dv.pdf  
mixed edge/vertex 6 strips 8 x 1/2 pe.  pattern download: 2889 x 2032 pix, 125 kB: doh.gif or as pdf: doh.pdf  
nice spiral: plaiting instruction: 1) i16↑↑a3 2) i4↑↑a21, i21↓↑a16 3) i22↑↑a9, i9↓↑a4, i17↑↑a8 4) i10↑↑a27, i28↑↑a15, .. 
vertex 1 strip (divided into 5 parts) 60 x 2/5 pe. (12 x 2/5 pe. per part)  pattern download: 3213 x 2200 pix, 236 kb: sr5.gif or as pdf: sr5.pdf 
Icosahedron platonic solid 12 vertices 30 edges 20 sides 20 equi lateral triangles (20 tr.) 
plain 1 strip (divided into 3 parts) 20 x 2 tr.  plaiting instruction: i3↓↑a6, i6↑↑a9, i9↓↑a2, i2↑↑a5, i10↑↑a3, i7↓↑a10, i5↓↑a8, i4↑↑a7, i8↑↑a1, and i1↓↑a4. pattern download: 2950 x 1480 pix, 217 kb: ivn.gif or as pdf: ivn.pdf Remark: the plain plaiting of the icosahedron can be done with one single strip with 10 inner and 10 outer quadrilaterals (rhombi); use the above plaiting instruction. A nice plaiting exercise.  
Pseudoglobe  plain 1 strip (divided into 5 parts) 20 x 2 tr.  pattern as pdffile: icoerde.pdf  
plaiting instructions  vertex 6 strips 10 x 2/3 tr.  pattern download: 2400 x 1560 pix, 98 kb: ic.gif or as pdf: ic.pdf  
edges 12 strips 5 x 2/3 tr. 
pattern download: 1800 x 1050 pix, 65 kB: ik6.gif or as pdf: ik6.pdf  
mixed edge/vertex 6 strips 4 x 2/3 tr. 6 x 1/2 tr. 1 tr.  pattern download: 1305 x 2017 pix, 120 kB: st6.gif or as pdf: st6.pdf 