Take a polaroid photo of someone you secretly lust for and whose picture you don't have. 

Don't rush. Take your time. It is important that the portrait comes out perfect. 

Without looking at the photograph, put it in an envelope, still white and undeveloped, immediately after it comes off the camera. 

Seal the envelope carefully, hide it in a secure place and never, never open it again. 

Julião Sarmento, SECRET (2020).