The role of the spectator

"The work becomes not so much Picasso's statement as a challenge to us to respond and, by responding, to give it meaning. In modernism altogether, art (not merely visual art alone) has been reoriented, placing the onus on the relationship not between the artist and the work of art, but rather between the work and the spectator."
From An Introduction to Les Demoiselles d'Avignon, by Christopher Green

Picasso painted Les Demoiselles in 1907, but it's worth considering in what ways we as writers challenge our readers to engage in a similar sort of viewing. In a painting, the subject's gaze can invite the viewer in. In a poem, what presents a similar invitation--at once seductive and confrontational?