They are able to detect near infrared signals and steer the cell movements towards their source. I have applied essentially two lines of reasoning to examine whether cells are intelligent. Space and time are not physical objects with which cells could interact, but they are the pre-condition of all physical objects. If cells can measure space and time variables such as angles, distances, curvatures or durations, they must have derived these abstract quantities from the physical objects of their environment. If cells have eyes, they must be able to order and integrate countless signals.
Images are the ordered set of a huge number of individual data.
If cells are capable of generating an image of their environment and react to it, they must be able to order a large number of signals and integrate them into a response action. The figure below shows one of the examples of this amazing ability of cells.