'Pacific Red (IV)' (2017) encapsulates the mesmerising metamorphosis and innovation that characterises Larry Bell’s 'Pacific Red' nesting box glass sculptures, which mark a turning point in the artist’s extraordinary practice and were a celebrated highlight of the 2017 Whitney Biennial. Bell’s nesting boxes are one of the most important examples of the artist’s freestanding glass wall sculptures, a subset of Bell’s practice which he began in 1968 in which the artist combines panes of glass in varying scales and configurations. These large, colourful outdoor works respond intuitively to the dynamics of space and are transformed by the particular conditions of natural light at different times of the day. Capturing the distinctive properties of the colour red, 'Pacific Red (IV)' exemplifies what Bell described as its 'emotional input'.