The sphere instructions are the illustrated written version of Sven Backstein's concrete sphere course for self-study. In it, he shows step by step how to make a hollow sphere from glass fibre concrete.
The level of difficulty is not high, so that even beginners can easily master the programme. Once learnt, the working technique taught allows not only the creation of spheres, but of course also any other shell-shaped workpieces.
The brochure comprises 16 pages in DIN A-4 format.
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