A portrait displayed at the National Gallery has puzzled art enthusiasts after a mum and daughter spotted what appears to be a Nike trainer.
Portrait of a Boy, painted by Dutch Master Ferdinand Bol in the 17th century, features an eight-year-old boy standing in the foreground holding a goblet.
The youngster is wearing a black jacket and cape, a white shirt with ruffled sleeves, auburn socks and black boots, in keeping with the time period.
