Blindsight

This spell gives the willing creature you touch the ability to perceive its surroundings without relying on sight. For the duration, the creature can see the shape (but not colour) of its surroundings out to a range of 60 feet.

Transparent but tangible objects (e.g the surface of water, a glass window, or an invisible creature) appear opaque to this sense, while opaque but intangible objects (e.g fog or an illusory image) are invisible to this sense. Flat images (such as drawings or text) are also invisible to this sense.