Pertti Kukkonen: Playing Ball, 2022. Photo: HAM/Kirsi Halkola Playing Ball Artist Pertti Kukkonen Porthaninkatu 15, 00530 Helsinki Indoor Sculpture Limited access: the work is available to view for the users of the premises only. The facade of the renovated Kallio General Upper Secondary School building displays the sculpture installation Playing Ball by Pertti Kukkonen. The installation consists of steel globes of different colours, which cast shadows on the wall. However, the shadows do not follow the logic of a single direction of light. Pertti Kukkonen is specialised in using concrete in his art, and he has created several works of public art in Finland. The work belongs to the City of Helsinki’s art collection, which is managed and curated by HAM. At map