In a mystical village where gravity can be selectively reversed by the magical Zephyr Stone, Lysander and Amara are playing a game in a walled garden. The Zephyr Stone is located at the center of the garden on a pedestal that allows anyone touching it to negate gravity's pull for themselves, causing them to float upwards. The garden is shaped like a perfect circle with a radius of four strides and surrounded by a wall that extends high into the sky. At the exact opposite end of the garden from the entrance is a tall willow tree, its branches and leaves form a thick canopy that obscures the view of the top of the wall from the ground. 

Lysander and Amara have decided to play a game of hide and seek where Amara would hide first and Lysander is seeking, using the Zephyr Stone to assist him. The rules they set are as follows: the seeker may use the Zephyr Stone only once during their turn, and the hider must remain hidden from the seeker's line of sight for as long as possible before being declared found.

Amara has decided to climb the willow tree for her hiding spot. She figures that with its thick foliage, Lysander will not be able to see her from the ground or from floating straight up from the Zephyr Stone, since the branches would block his view. Once Amara is in position, she signals to Lysander that she is ready, and the game begins. Lysander, standing at the Zephyr Stone, touches it and negates gravity for himself. He now has the choice of floating straight up or navigating through the space by pushing off from nearby structures. 

What should Lysander's strategy be to maximize his chance of spotting Amara, given the constraints of the Zephyr Stone's use and the layout of the garden? Assume that Lysander and Amara are both excellent climbers and understand the properties of the Zephyr Stone through practice.
The strategy Lysander should employ hinges upon his understanding of the garden's layout, the Zephyr Stone's properties, and the implications of selectively reversing gravity for himself.

To begin, Lysander should keep in mind the Zephyr Stone's one-time-use rule during his turn. Since he can only use it once to negate gravity for himself, he must choose his movement wisely. He should avoid floating straight up initially, as this wouldn't provide a significant advantage due to Amara's well-thought-out hiding spot within the willow tree's foliage. From underneath the canopy, looking upwards, his line of sight would be obscured by the leaves and branches, making it unlikely for him to spot Amara from that angle.

Given this understanding, Lysander's first action should be to observe the willow tree from the ground without touching the Zephyr Stone. From there, he should scout for any signs of disturbance or movement within the branches that might give away Amara's position. If he sees none, he should then plan to utilize the Zephyr Stone not by floating straight up, but by navigating laterally through the garden space.

After scanning the willow tree from the ground, Lysander should touch the Zephyr Stone, float up slightly to reach the garden's wall, and then use his climbing skills to propel himself sideways by pushing against the wall, guiding his trajectory around the circumference of the garden. By navigating around the edge, Lysander would be able to change his perspective and possibly catch a glimpse of Amara through a gap in the foliage.

As he moves along the periphery of the garden, Lysander must also pay attention to his elevation. If he floats too high or too low, the angle might not permit a clear line of sight through the branches. In order to optimize his vantage point, he should aim to stay parallel to the mid-height of the willow tree, since Amara is likely to have climbed to a position where she would enjoy a balance of good concealment and comfort.

Continually adjusting his position, Lysander should push off the wall with controlled force to circle around the garden's interior while maintaining the optimal height. This careful maneuvering requires him to be patient, observant, and to use the zero-gravity effect to his full advantage without succumbing to disorientation or unnecessary altitude changes.

Through this strategy, Lysander ensures a gradual, methodical approach that affords him a 360-degree purview of the willow tree from an array of angles. Given the density of the foliage, there's a high chance Amara could be spotted from at least one angle as he circumnavigates the walled garden and the leaves shift with the wind or due to her need to adjust her own position, even subtly. 

If he successfully maintains his elevation while circling the tree, the chances are in his favor that he will eventually see a part of Amara, be it her clothing, a limb, or even the displacement of a branch signaling her presence. Upon spotting her, Lysander would declare her found, thus concluding the game of hide and seek under the magic-induced conditions provided by the Zephyr Stone.