Shakespeare turns a lover's body into a painter's studio with glass windows
In Sonnet 24 the speaker's eye becomes an artist, his heart the canvas and his body the frame. The beloved can only see the finished portrait by looking through the painter himself. Then, in the last two lines, Shakespeare pulls the rug away: eyes copy surfaces, but they cannot read a heart.
The poem runs one elaborate comparison from start to finish. The speaker says his eye has painted the beloved's beauty onto the tablet of his heart, and his own body serves as the frame holding the picture. Perspective, the trick of making a flat image look deep, is named as the best part of the painter's craft, which lets Shakespeare argue that the beloved has to peer through the artist to find where the true likeness hangs.
That likeness lives in what the speaker calls his bosom's shop, a workshop still displaying the picture. Its windows are glazed with the beloved's eyes, so the image and the viewer fold into each other. The third quatrain spells out the trade: one pair of eyes drew the beloved's shape, and the other pair serves as windows into the speaker's chest, where even the sun enjoys peeping in to gaze at the portrait.
The couplet undercuts all this cleverness. The speaker admits that eyes, for all their skill, lack one gift: "They draw but what they see, know not the heart." The painted likeness may be exact, yet neither lover can tell from looking what the other truly feels. A poem that seemed to celebrate perfect mutual sight ends on doubt about whether sight is worth much in love.
The sonnet is one of 154 that Shakespeare left, alongside some 39 plays and three long narrative poems. He built his London career as an actor, writer and sharer in the Lord Chamberlain's Men, later renamed the King's Men once James VI of Scotland took the English throne. Few records of his private life survive, which has fed endless guessing about whom poems like this one address and what he believed.
Source: Sonnet 24: Mine eye hath play'd the painter and hath stell'd
