AbstractThe trend of population aging led European institutions to choose 2012 as the European Year for Active Ageing and Solidarity between Generations. Taking advantage of this fact and aware of the potential of socio-economic contribution of elderly for society development, the importance of creating opportunities towards an active ageing and the significance of occupational therapy (including crochet) as a way to reconstruct healthy behaviours, we engaged senior citizens in an activity held on behalf of Festa da Ciência. More specifically, they participated in the construction of a coral reef made of crochet hyperbolic models combining Biology, Mathematics, colour and fun.