Valid until 20 May 2018 on standard deliveries. Cannot be used in combination with other discount codes. The voucher can only be used for orders containing 5 products max. A combination with volume discounts isn’t possible. Valid on www.spreadshirt.co.uk. Not valid in Spreadshirt’s partner shops.
Good for you and the environment: This T-shirt is made from organic threads stemming from ecologically sound production. Part of the “Earthpositive Collection” by Continental Clothing, it has been produced with renewable energy sources alone.
Classic fit with a high round neck
Durable quality: 155g/m²
Material: 100% cotton from organic production
Penrose triangle, Impossible, illusion, Escher
The Penrose tribar is an impossible object. The mathematician Penrose describing it as "impossibility in its purest form". If a line is traced around the triangle, a 3-loop Möbius strip is formed.
Tags: Impossible Triangle optical, architecture dimension object, celtic technics triforce, endless knot infinity, eye puzzle einstein, illusion Escher penrose, line sierpinski construction, magical geometry 3d, number tri bar, tribar mathematics möbius