Calceolaria in the Alpine House, Harlow Carr

Calceolaria ‘Walter Shrimpton’ in the new Alpine House at the RHS Gardens in Yorkshire at Harlow Carr. Extraordinary optical illusion going on here..

… there has to be a reason for these markings  – and now I just need to find out what it is.

A slightly smaller relative, Calceolaria fothergillii, pictured below.